chem 31.1 review for finals

Review for Finals

From the given compounds below,

which will not form a silver

mirror in Tollens Test but will give a positive result in Iodoform

Test?

3-hexanol

3-pentanone

2-methylcyclohexanal

phenylethanone

Why was Ingrain dyeing employed

in the Sudan I experiment? Fully formed Sudan I is too large to anchor itself on the cloth

The cloth and Sudan I have the same intermolecular forces of attraction

Sudan I is able to form chemical interaction with the cloth via salt

linkages

Sudan I can bond well with the functional groups present in the cloth

Which will react the fastest in

Seliwanoffs Test?

Fructose

Glucose

Galactose

Starch

Which of the following cannot be

used as a starting material for

soap making?

Cooking oil

Mayonnaise

Glycerol

Lye

Which substituent enhances the

acidity of carboxylic acids when

bonded directly to the acyl

carbon?

-CH2CH3

-OCH3

-OH

-NO2

Hinsberg test for N-

methylethanamine will yield a

product that is ___ in excess

NaOH and ___ in 5% HCl acid.

Soluble, insoluble

Soluble, soluble

Insoluble, insoluble

Insoluble, soluble

Which among the following

combination (compound-reagent-

result) is correct?

Acetone - Ag(NH3)2+ silver mirror

Propanal Na citrate, NaHCO3 and CuSO4 in water brick red ppt

Formalin Schiffs reagent light pink color

Cylopentanone I2 in KI and NaOH yellow ppt

Which of the following is not a

property of soap? Soaps have hydrophobic and hydrophilic parts

Soaps are the result of the reaction between glucose and potassium

hydroxide

The hydrophobic part of soap is its nonpolar tail

The nonpolar part causes the formation of micelles

Esters form a magenta colored

complex with FeCl3 after

treatment with ______.

NH4OH with alcoholic KOH

Alcoholic NH4Cl and alcoholic KOH

Neutral NH4Cl and alcoholic KOH

Alcoholic NH2OHHCl and Alcoholic KOH

Which of the following is formed

upon addition of benzensulfonyl

chloride and NaOH with aniline?

Sulfonamine

Sulfonamide

Sulfoxamine

Sulfonylamide

Which of the following acyl

compound-alcohol pair produces

ester in the least amount?

Methanoic anhydride and ethanol

Acetic acid and butanol

Sodium butanoate and propanol

Ethanamide and 2-propanol

Ribonucleic Acid, RNA, contains

the sugar ribose. What test can

be used to detect its presence in

a sample of RNA?

Hydroxamic Acid Test

Bials Test

Ninhydrin Test

Hinsberg Test

Which type of amine cannot be

characterized using Hinsbergs method?

Primary Amine

Secondary Amine

Tertiary Amine

Amphoteric Amine

A soap molecule is a/an

Ester

Carboxylic acid

Amide

Carboxylate Salt

The product of the hydrolysis of this

acid derivative changes a litmus paper

from red to blue and produces a

distinct sour smell. What could be this

compound?

Which of the following would prevent

the formation of side products in the

synthesis of Sudan I?

Preparing phenyldiazonium chloride solution in a acidic medium

Recrystallization of the product

Preparing -naphthol solution in acidic medium

None of the above

What test/reagent may be used

to confirm the product of

methanol and benzoic acid upon

refluxing with H2SO4 ?

Friedel-Crafts alkylation

5% NaHCO3

Lucas Test

Hydroxamic Acid Test

3-phenylbutanal will give positive

result on the following tests

except:

Reaction with 2,4-DNPH

Schiffs test

Iodoform test

Benedicts test

Modified True or False

1. Seliwanoffs test is a test for RNA.

2. Compounds that yield the same

osazone are known as enantiomers.

3. Soap molecules tend to form

micelles due to their hydrophobic

heads.

Modified True or False

1. Bials Test is a test for RNA.

2. Compounds that yield the same

osazone are known as epimers.

3. Soap molecules tend to form

micelles due to their hydrophobic

tails.

4. Reaction of acetic acid with FeCl3

gives a flesh colored precipitate.

5. Refluxing purifies the synthesized

ester through removal of excess water

by evaporation.

6. In the synthesis of ester, H2SO4 acts

as the catalyst by making the C=O of

the carboxylic acid a good leaving

group.

7. 2-pentanol and acetone cant be differentiated using Iodoform test.

4. Reaction of acetic acid with FeCl3

gives a Red solution/red complex.

5. Distillation purifies the synthesized

ester through removal of excess water

by evaporation.

6. In the synthesis of ester, H2SO4 acts

as the catalyst by making the O-H of

the carboxylic acid a good leaving

group.

7. 2-pentanol and acetone cant be differentiated using Iodoform test.

TRUE!

8. The coupling reagent should contain

strongly electron donating groups to

facilitate the coupling reaction in the

synthesis of diazo compounds.

9. Diazotization requires primary

alkylamines to react with HONO to

produce the diazonium salt.

10. Base hydrolysis of primary amides

yields a vapor that turns litmus

paper red to blue.

8. The coupling reagent should contain

strongly electron donating groups to

facilitate the coupling reaction in the

synthesis of diazo compounds. TRUE

9. Diazotization requires primary

aromatic amines to react with HONO

to produce the diazonium salt.

10. Base hydrolysis of primary amides

yields a vapor that turns litmus

paper red to blue. TRUE

11. Cyclobutanol produces a yellow

orange precipitate with 2,4-DNPH.

12. In diazotization, sodium nitrite is

converted to HNO2, the primary

diazotization reagent.

13. Hydrolysis of polysaccharides takes

time due to several double bonds

that need to be broken.

14. Given 1 mole of triglyceride, three

moles of KOH is necessary for

saponification.

11. Cyclobutanol produces a yellow

orange solution with 2,4-DNPH.

12. In diazotization, sodium nitrite is

converted to HNO2, the primary

diazotization reagent. TRUE

13. Hydrolysis of polysaccharides takes

time due to several glycosodic bonds

that need to be broken.

14. Given 1 mole of triglyceride, three

moles of KOH is necessary for

saponification. TRUE

Azo DYES!!! Give the amine and

coupling compound. Eriochrome Black T- complexometric indicator

Amine Coupling agent


coupling compound.

Fast Yellow AB- food dye (harmful)

AMINE

Coupling Agent


coupling compound.

Alizarin Yellow R pH indicator

Amine

Coupling Agent

Azo DYES!!! From the reagents,

give the Azo Dye!

Citrus Red 2 carcinogenic dye used on some skin of oranges

Azo DYES!!! From the reagents,

give the Azo Dye!

Methyl Red used as pH indicator

CHEMICAL Differentiation! Give

test/reagent and visible result that

would differentiate the compounds.



would differentiate the compounds. FeCl3 colored complex

Lucas Test - layer




5% NaHCO3 - effervescence

2,4-DNPH yellow orange crystals

Tollens Test silver mirror

Benedicts Test brick red ppt

Schiffs Test purple/violet complex

pH acidic or solubility in NaOH



would differentiate the compounds. Hinsberg Test

Dense layer/residue

Test for Nitrogen

Blue green solution



would differentiate the compounds. Iodoform yellow

ppt

Hinsberg Test - residue

Schiffs Test violet complex

T-butyl chloride, AlCl3 orange crystal

Unknown Analysis: Draw the Structure of the

Unknown Compound Resveratrol a polyphenol found in the

skin of red grapes, with formula C14H12O3 Test/Reagent Observation/ Result Inference

Ignition test (1) Aromatic Ring present

Conc. H2SO4 soluble (2)

(3) White to yellow/orange

crystals

Aromatic ring is present

KMnO4 (4) Alkene part is present

(5) Yellow solution, negative Saturated part is absent

(6) Highly colored complex 3,5-disubstituted phenol is

present

Para-substituted phenol is

also present

2,4-DNPH Yellow solution, no ppt (7)

5% NaHCO3 NVR (8)

(9) negative Ester group is absent


Unknown Compound Resveratrol a polyphenol found in the

skin of red grapes, with formula C14H12O3 Test/Reagent Observation/ Result Inference

Ignition test Sooty Flame Aromatic Ring present

Conc. H2SO4 soluble Solubility class: N

AlCl3, t-butyl chloride White to yellow/orange

crystals

Aromatic ring is present

KMnO4 Decolorization, brown ppt Alkene part is present

Br2 in water, Light Yellow solution, negative Saturated part is absent

FeCl3 Highly colored complex 3,5-disubstituted phenol is

present

Para-substituted phenol is

also present

2,4-DNPH Yellow solution, no ppt No carbonyl group

5% NaHCO3 NVR No carboxylic acid part

Hydroxyamic Test negative Ester group is absent

Unknown Analysis: Draw the Structure

of the Unknown Compound Resveratrol a polyphenol found in the

skin of red grapes, with formula C14H12O3


Unknown Compound Unknown compound with formula: C8H9O2N

Compound is para substituted Test/Reagent Observation Interference

5% HCl NVR (1)

(2) Yellow soln Not an aldehyde or

ketone

5% NaHCO3 NVR (3)

Benzenesulfonyl

chloride

No residue (4)

FeCl3 (5) Phenol group present

Hydroxamic acid test (6) No ester group

present


Unknown Compound Unknown compound with formula: C8H9O2N

Compound is para substituted Test/Reagent Observation Interference

5% HCl NVR Not basic

2,4-DNPH test Yellow soln Not an aldehyde or

ketone

5% NaHCO3 NVR Not strong acid no

RCOOH

Benzenesulfonyl

chloride, NaOH

Insoluble secondary amine

FeCl3 Colored complex Phenol group present

Hydroxamic acid test Clear solution No ester group

present

Unknown compound with formula: C8H9O2N

Compound is para substituted

Reminder for Final Exam:

Date: October 6, 2012 Saturday

Time: 4-6 pm

Coverage: expt 10 16

Review on different qualitative test (know reagents and result)

chem 31.1 review for finals

Documents

soluble hinsberg test

formed sudan

tollens test

iodoform test

seliwanoffs test

salt linkages sudan

positive result

property of soap