what’s wrong with the following iupac name? tetraaminecopper(ii) ion
TRANSCRIPT
What’s wrong with the following IUPAC name?
Cu(NH3)42 +
Tetraaminecopper(II) ion
Correct IUPAC name
Tetraamminecopper(II) ion
ammine, not amine
Cu(NH3)42 +
What’s wrong with the following IUPAC name?
2-Methylpentan-2,4-diol
C C C C CH
CH3
OH OH
H H
H
H
H
H
H
H
Correct IUPAC name
2-Methylpentane-2,4-diol
C C C C CH
CH3
OH OH
H H
H
H
H
H
H
H
What’s wrong with the following IUPAC name?
3,7-dimethyloct-6-eneal
C C
CH2CH2CHCH2CHO
CH3
CH3
CH3 H
Correct IUPAC name
3,7-dimethyloct-6-enal
C C
CH2CH2CHCH2CHO
CH3
CH3
CH3 H
What’s wrong with the following IUPAC name?
Br
Br
Dibromocyclohexane
Correct IUPAC name
trans-1,2-dibromocyclohexane
Br
Br
What’s wrong with the following structure?
Cl O-
Correct structure
Cl O-
Correct structure
Cl O-
Cl O
H
+ H+
What’s wrong with the following structure?
C N-
Correct structure
C N-
Correct structure
C N-
H C N
+ H+
What’s wrong with the following structure?
C O
Correct structure
C O
What’s wrong with the following structure?
N
O O
Correct structure
N
O O
What’s wrong with the following structure?
N
O O-
Correct structure
N
O O-
What’s wrong with the following structure?
N
O O
+
Nitronium ion
Correct structure
NO O+
Nitronium ion
What’s wrong with the following structure?
O
O O
Correct structure
O
O O
What’s wrong with the following representation?
n =
n =
n = n =
2
3
45
n = 1
Energy level diagram
What’s wrong with the following representation?
n =
n =
n = n =
2
3
45
2
wrong
n = 1energy gap between n = & n = 2 1
should be greater than that between n = infinity & n =
Correct representation
n =n = n =
3
45
2
n = 1
energy gap between n = & n = 2 1
should be greater than that between n = infinity & n =
n = 2
What’s wrong with the following representation?
potentialenergy
reaction coordinate
transition state
What’s wrong with the following representation?
potentialenergy
reaction coordinate
transition state
intermediate
What’s wrong with the following representation?
Al
Cl
Cl
Al
Cl
Cl Cl
Cl
Correct representation
Al
Cl
Cl
Al
Cl
Cl Cl
Cl
What’s wrong with the following representation?
C C
Cl Cl
H H
Correct representation
Cl Cl
C C
H H
What’s wrong with the following representation?
N
H
H
H
B
F
F
F
Correct representation
N B
H
HH
FF
F
What’s wrong with the following representation?
Be
Cl
Cl
Be
Cl
Cl
Cl
ClBe
Correct representation
Be
Cl
Cl
Be
Cl
Cl
Cl
Cl
Be
What’s wrong with the following representation?
+ OO3 O2UV
Correct representation
O+O3 O2UV
Correct representation
O
What’s wrong with the following representation?
[Co(H2O)6]2+ Cl2
-
Correct representation
[Co(H2O)6]2+ 2Cl-
What’s wrong with the following representation?
Pt(s) /H2(g) /2H+(aq) Cu2+(aq) /Cu(s)
E o = +0.34V
Cell diagram of the standard electrode potential of Cu2+(aq)/Cu(s) couple
Correct representation
Pt(s) /H2(g, 1atm) /2H+(aq, 1M) Cu2+(aq, 1M) /Cu(s)
E o = +0.34V
Cell diagram of the standard electrode potential of Cu2+(aq)/Cu(s) couple
What’s wrong with the following representation?
Cl CF2Cl
Correct representation
Cl CF2Cl
“Fish-hook arrow/ half arrow“ to represent flow of an odd electron.
What’s wrong with the following representation?
C+
CH3
H C2H5
HO-
C
CH3
HO H
C2H5
Correct representation
C+
CH3
H C2H5
HO-
C
CH3
HO H
C2H5
Curly arrows flows from –ve charge center to +ve charge center.
What’s wrong with the following representation?
CH3 C
O
O-
CH3 C
O
O-
Correct representation
CH3 C
O
O-
CH3 C
O
O-
“” to represent resonance
What’s wrong with the following representation?
CH3 F
Negative inductive effect of F
Correct representation
Negative inductive effect of F
CH3 F
“ ” to represent inductive effect
What’s wrong with the following representation?
1s2 2s2 2p6 3s2 3p6 4s2 3d2
Correct representation
Electronic configuration should be in ascending order of principal quantum no
1s2 2s2 2p6 3s2 3p6 3d2 4s2
What’s wrong with the following representation?
Enthalpy change of combustion of nitrogen = 40 kJ mol-1
Correct representation
+ve/-ve sign should be included in the H values of endothermic/exothermic en
thalpy changes
Enthalpy change of combustion of nitrogen = +40 kJ mol-1
What’s wrong with the following representation?
Enthalpy Change of formation of water:
H2 + O2 H2O H = -420 kJ mol-1
Correct representation
Physical states should be included in thermochemical equations.
Enthalpy Change of formation of water:
H2 (g)+ ½O2 (g) H2O(l) H = -420 kJ mol-1
Equations should be balanced.
What’s wrong with the following representation?
Partial pressure of H2 – [H2(g)]
Correct representation
[ ] – concentration expressed in terms of mol dm-3
Partial pressure of H2 – PH2(g)
What’s wrong with the following equation?
RCH2OH KCN
RCH2CN
Correct reaction pathway
RCH2OH
RCH2Cl
RCH2CN
PCl5NaCN
alcohol, reflux
What’s wrong with the following equation?
CH3 C
O
OH
NaBH4
CH3CH2OH
Correct reaction pathway
CH3 C
O
OH
CH3CH2OH1. LiAlH4, ether
2. water
What’s wrong with the following equation?
C C
R
H
H
H
LiAlH4RCH2CH3
Correct reaction pathway
C C
R
H
H
H
RCH2CH3
H2, Pt
What’s wrong with the following equation?
CH3
C C
H
H
H
conc H2SO4
H
H2O
CH3
C C
OSO3H H
H
H
CH3
C C
H
H
HH
OH
oC0 - 10
CH3
C C
H
H
H
conc H2SO4
H
H2O
CH3
C C
OSO3H H
H
H
CH3
C C
H
H
HH
OH
Correct reaction pathway
What’s wrong with the following equation?
R + NH3C
O
OH
C
O
R
NH2
Correct reaction pathway
heat+ NH3 C
O
R
O-NH4
+
R C
O
OH
R C
O
NH2
Correct reaction pathway
+NH3
C
O
RR C
O
OH
R C
O
NH2Cl
PCl5
HCl+
What’s wrong with the following equation?
CH3 CH2 C
O
OCH3
conc. H2SO4CH3CH2COOH + CH3OH
Correct reaction pathway
CH3 CH2 C
O
OCH3
conc. H2SO4CH3CH2COOH + CH3OH
What’s wrong with the following equation?
R C
O
+ CN- R C OH
CN
H
H
Correct reaction pathway
R
C
H
O
HCNC
RH
OH
CN
+ C
HO
NCR
H
What’s wrong with the following equation?
+
CH3
C
O
OH
I2, NaOHCHI3HCOO-
Correct reaction pathway
+
CH3
C
O
I2, NaOHCHI3
HCOO-
H
What’s wrong with the following equation?
CH3CONH2
H3O+
CH3COOH + NH3
Correct reaction pathway
CH3CONH2
H3O+
CH3COOH + NH4+
What’s wrong with the following equation?
RCH2CH2Clconc. H2SO4
RCH=CH2
Correct reaction pathway
RCH2CH2Cl RCH=CH2
alcoholic KOH
heat
What’s wrong with the following equation?
NH2 NH2
Br2(aq)
Br
Correct reaction pathwayNH2
Br2(aq)Br
NH2
Br
Br
NH2
CH3COCl Br2(aq)
O
NHCCH3
O
NHCCH3
Br
NaOH(aq)
NH2
Br
What’s wrong with the following equation?
+ CH3COOHconc. H2SO4
O
C
OCH3
OH
Correct reaction pathway
+
O-
CH3COCl
O
C
OCH3
What’s wrong with the following equation?
CH3CH CHCH2CH3
O31.
2. H2OCH3CHO + CH3CH2CHO
Correct reaction pathway
CH3CH CHCH2CH3
O31.CH3CHO + CH3CH2CHO
2. H2O, Zn
What’s wrong with the following equation?
COH
+ NH2NH2
CH NNH2
Correct products
COH
+ NH2NH2
CH NNH2
C
H
N
N C
H
What’s wrong with the following equation?
OH
+
N N
OH
N N+
Correct product
+N+
OH
NOH
NN
What’s wrong with the following equation?
OH
+ Na2CO3
ONa
2 2 + H2O + CO2
Correct products
OH
+ Na2CO3
ONa
+ NaHCO3
Phenol is less acidic than H2CO3,
but more acidic than HCO3-.
What’s wrong with the following equation?
Two dipeptides can be formed from 2-aminoethanoic acid and 2-aminopropanoic acid
+
H
NH2 C
H
COOH
H
NH2 C
H
C
O
N
HH
NH2 C COOH
CH3
H
C COOH
CH3
+
NH2 C
H
CH3
C
O
N
H
H
C COOH
NH2 C
H
COOH
CH3
H
NH2 C COOH
H
H
Correct products
C
H
HOOC
N
H
C
O
C
H
H
NH2
CH3 *H
C
H
CN
H
C
NH2
COOH
H
O
* CH3
C
H
H
COOHN
C
H
O
C
H
CH3
NH2
* C
HC
H
HCH3 * CN
NH2
O
H
COOH
What’s wrong with the following equation?
CH3 CH2 C CH2 CH2 CH3
H
OH
conc. H2SO4
heat
CH3CH2
C C
H H
CH2CH3
Correct products
CH3 CH2 C CH2 CH2 CH3
H
OH
CH3CH2
C C
H H
CH2CH3
CH3CH2
C C
H
H
CH2CH3
C C
H H
CH3CH2CH2CH3
C C
H
HCH3
CH2CH2CH3
conc. H2SO4
heat
What’s wrong with the following equation?
heatCH3 CH2 C CH2 CH2 CH3
CH3CH2
C C
H H
CH2CH3
CH3
Br
alcoholic KOH
Correct products
CH3CH2
C C
H H
CH2CH3
CH3CH2
C C
H
H
CH2CH3
C C
H H
CH3CH2CH2CH3
C C
H
HCH3
CH2CH2CH3
alcoholic KOH
heat
CH3
Br
C C
CH2CH2CH3
H
H
CH2CH3
CH3 CH2 C CH2 CH2 CH3
Correct products
C C
X
H C
C
H
H
B-
C C
X
H C
C
H
H
B-
C C
X
H C
C
H
HB
-
What’s wrong with the following equation?
Na + O2(g)(s)4 2Na2O (s)
Correct product
Na + O2(g)(s)4 2Na2O (s)
Na2O2+Na(s)2 O2(g) (s)
main reaction
side reaction
What’s wrong with the following reaction conditions?
using AgNO3(aq) to detect chloride ion
Correct reaction conditions
using AgNO3(aq) + HNO3(aq)
to detect chloride ion
What’s wrong with the following reaction conditions?
using glowing splint to detect hydrogen;
Correct reaction conditions
using burning splint in the test of hydrogen
What’s wrong with the following reaction conditions?
using BaCl2(aq) to detect sulphate ion
Correct reaction conditions
using BaCl2(aq) + HCl(aq)
to detect sulphate ion
What’s wrong with the following reaction conditions?
using LiAlH4, water in the reduction of
carbonyl compounds
Correct reaction conditions
using LiAlH4, ether in the
reduction of carbonyl compounds
LiAlH4 + 4H2O Li+ + Al3+ + 4OH- + 4H2
What’s wrong with the following reaction conditions?
using NaNO3(s) + HCl(aq)
in the azotization of aromatic amines
Correct reaction conditions
using NaNO2(s) + HCl(aq) (<5oC)
in the azotization of aromatic amines
What’s wrong with the following description?
in Lucas Test (to distinguish 1o, 2o & 3o alcohol), 3o alcohol forms precipitate readily as alkyl halide is immiscible
with water
Correct description
in Lucas Test (to distinguish 1o, 2o & 3o alcohol), 3o alcohol turns turbid readily as alkyl halide is immiscible with water.
What’s wrong with the following description?
Landfilling is an appropriate disposal method for PVC.
Correct description
Landfilling is not regarded as an appropriate disposal method for PVC because PVC is non-biodegradable;
The proper way is by incineration (with adequate supply of air at sufficient higher temperature) and treat the flue gas in wet scrubber with Na2CO3(aq).
What’s wrong with the following description?
first emission line in the Balmer series involves electronic transition between n = 2 to n = 0.
Correct description
quantum number can have values 1,2,3 etc; first emission line in Balmer series involves electronic transition between n = 3 to 2; convergence limit in Balmer series involves electronic transition between n = infinity to 2.
What’s wrong with the following expression?
Kc =[CH3COOH(aq)]
CH3COOH(aq) + H2O(l) CH3COO-(aq) + H3O
+(aq)
[CH3COO-(aq)] [H3O+(aq)]
Correct expression
OR
CH3COOH(aq) + H2O(l) CH3COO-(aq) + H3O
+(aq)
Kc =
Ka =[CH3COOH(aq)]
[CH3COOH(aq)] [H2O(l)]
[CH3COO-(aq)] [H3O+(aq)]
[CH3COO-(aq)] [H3O+(aq)]
What’s wrong with the following expression?
Kc = [CH3COOC2H5(l)]
+ H2O(l)+C2H5OH(l)CH3COOH CH3COOC2H5(l)
[CH3COOH(l)][C2H5OH(l)]
Correct expression
Kc = [CH3COOC2H5(l)] [H2O(l)]
+ H2O(l)+C2H5OH(l)CH3COOH CH3COOC2H5(l)
[CH3COOH(l)][C2H5OH(l)]
What’s wrong with the following expression?
AgCl(s) Ag+(aq) + Cl
-(aq)
Kc = [Ag
+(aq)][Cl
-(aq)]
[AgCl(s)]
Correct expression
Cl-(aq)AgCl(s) Ag
+(aq) +
[Ag+(aq)][Cl
-(aq)]Kc' =
[AgCl(s)] is a constant term.
What’s wrong with the following expression?
The decay of carbon-14 starts after the death of living things.
Correct expression
The ratio of carbon-12 and carbon-14 remains unchanged in a living organism, but decreases slowly after the death of living things.
What’s wrong with the following expression?
In paper chromatography, cellulose in the filter paper is the stationery phase.
Correct expression
In paper chromatography, the thin film of water on the chromatography paper acts as the stationary phase and that partition is the underlying principle of paper chromatography.
What’s wrong with the following expression?
criteria in choosing an indicator – pH range of colour change close to the equivalence point
Correct expression
criteria in choosing an indicator – the pH range of colour change of the indicator falls into the steepest part of the titration curve/ pKi is very close to the pH of the solution at equivalence point.
What’s wrong with the following expression?
A rise in temp increases the forward reaction rate and the equilibrium position shifts to the product side.
Correct expression
A rise in temp. increases both the forward & backward reaction rates. For endothermic reaction the extent of increase in forward reaction rate is greater than that of backward reaction rate. Thus the position of equilibrium shifts to the product side. In case of endothermic/exothermic reaction, Kc increases/decreases with temp.
What’s wrong with the following expression?
catalyst increases both reaction rate & yield.
catalyst lowers the activation energy of the reaction.
Correct expression
catalyst increases the reaction rate but yield remains unchanged.
catalyst provides a new pathway with lower activation energy.
What’s wrong with the following expression?
b.p. of H2O > OF2 because intermolecular
hydrogen bond exists in water.
Correct expression
b.p. of H2O > OF2 because intermolecular hydr
ogen bond exists in water and van der Waals’ force between OF2.
more energy is needed to overcome hydrogen bond, accounting for the higher boiling point.
What’s wrong with the following expression?
Boiling point of H2O > H2S because O is more
electronegative and forms stronger hydrogen bonding.
Correct expression
Boiling point of H2O > H2S
because O is more electronegative
intermolecular hydrogen bond in H2O
Van der Waals’ forces in H2S is weaker
more energy is needed to overcome hydrogen bond, accounting for the higher boiling point.
What’s wrong with the following expression?
hcp, fcc and bcc are close-packing arrangement.
Correct expression
Hexagonal close-packing and face-centred cubic close-packing have the maximum co-ordination number, which is equal to 12. Body-centred cubic has open structure and the coordination number is equal to 8.
What’s wrong with the following expression?
NaCl has ‘face-centred cubic structure’ and CsCl has ‘body-centred cubic structure’
Correct expression
In NaCl, both Na+ and Cl- ions adopt face-centred cubic lattices, which interpenetrate each other. The structure shows 6:6 coordination.
In CsCl, both Cs+ and Cl- ions adopt simple cubic lattices, which interpenetrate each other. The structure shows 8:8 coordination.
What’s wrong with the following expression?
oxidative rancidity of oils and fats involve RCOO.
Correct expression
oxidative rancidity of oils and fats involve alkylperoxyl radical (ROO.) but not the carboxyl radical (RCOO.);
What’s wrong with the following expression?
The functional group in benzoic acid is ‘alkanoic acid’ and ‘alkanol’ is the functional group of phenol.
Correct expression
‘Carboxylic acid’ is the functional group of benzoic acid. ‘Hydroxyl group’ is the functional group of phenol.
What’s wrong with the following expression?
“Chromium is harmful”
Correct expression
Chromium compounds are toxic to aquatic life.
What’s wrong with the following expression?
Aspirin has sude effects.
Correct expression
Aspirin could cause damage to stomach lining.
What’s wrong with the following expression?
Order is the sum of the powers of the concentration terms in the rate equation.
Correct expression
Order is the sum of the powers of the concentration terms in the experimentally determined rate equation.
What’s wrong with the following expression?
Half-life of a first order reaction increases with initial concentration.
Correct expression
Half-life of a first order reaction is independent of initial concentration or pressure.
What’s wrong with the following expression?
With an alkali, halogen forms halide and halate(V).
Correct expression
With an alkali, chlorine forms ClO- and ClO3-
under different conditions, bromine forms mainly BrO3
- with some BrO-, and iodine only IO3-.
What’s wrong with the following expression?
Boric acid is a tribasic acid.
Correct expression
Boric acid is a monobasic acid.
What’s wrong with the following expression?
CCl4 is stable towards water, but SiCl4 hydrolyses readily in water. This is because C is more electronegative than Si.
Correct expression
Low-lying vacant orbital is not available in carbon.
What’s wrong with the following expression?
Phenol is more acidic than ethanol because the negative charge on the phenoxide ion can delocalise into the benzene ring.
Correct expression
Due to the delocalization of the negative charge, the phenoxide ion is stablized. The following equilibrium shifts to the RHS.
OH O-
+ H+
What’s wrong with the following expression?
Tertiary carbocation is more stable than the primary carbocation.
Correct expression
Positive inductive effect of the methyl group stabilises the tertiary carbocation.
Tertiary carbocation is more stable than the primary carbocation.