MCQs of Organic Chemistry

MCQs of Organic Chemistry

1) In the primary alkyl halides, hydrogen is bonded to that carbon atom which is further attached to carbon atoms?a) 1b) 2c) 3d) none2) Which of the following is least reactive?a) H2Ob) etherc) alcohold) H2SO4

3) which of the following is the formula of methylene chloride?a) CH2Cl2b) CH3Clc) CHCl3d) CCl44) The planer shape is made in which type of hybridization?a) SP3b) SP2c) SPd) none5) which catalyst is used to convert carboxylic acid into alcohol?a) NaBH4b) LiAlH4c) H2SO4d) none6)methylated alcohol contains:a)95% alcoholb)80% alcoholc)90%alcohald)none7) which is a synthetic polymer?a) polystyreneb) PVCc) polyethylened) none8)the reactivity order of alkyl halides for a particular alkyl group is:a)F>Cl>Br>Ib)Cl>Br>F>Ic)I>Br>Cl>Fd)Br>I>Cl>F

9 )which has the maximum boiling point?a) ethanolb) propanalc) methanold) 2-hexanone

10) which one is artificial polymer?a) lipidsb) starchc) cellulosed) polyethylene11) which of the following is not a Nucleophile?a) H2Ob) H2Sc) BF3d) NH312) formula of methylene chloride is:a)CH2Cl2b)CH3Clc)CHCl3d)CCl413) universal solvent isa)H2Ob)etherc)alcohold)H2SO4

14)which of the following is least reactive?a)esterb)etherc)aldehydesd)ketones15)when the molecule of H2 is removed from benzene , then it turns into:a)cyclo-hexaneb)toluenec)phenold)formaldehyde 16)which of the following compound can directly be formed from acetic acid?a)acetamideb)acetic anhydridec)acetyl chlorided)both b &c17)which of the following reagent will react with both aldehydes and ketones?a)Grignard reagentb)Tollens reagent c)Fehlings reagent d)Benedicts reagent

18) acetylene under pressure over an organo-nickle catalyst at 70 centigrade converts intoa) benzeneb) toluenec) benzoic acidd) phenol

19) the mode of hybridization in alkane is _________ and three hybrid orbits are formeda) sp3b) sp2c) spd) sp4

20) which of the following agent oxidizes the aldehydes to carboxylic acidsa) alcoholb) Grignard reagentc) tollens reagentd) both a and c

21) the IUPAC name of formic acid isa) methanoicb) ethanoicc) propanoicd) pentanoic

22) the enzyme which is used for treatment of blood cancer in children isa) L-asparaginaseb) alkaline phosphatasec) thrombind) LHD-1

23) which of the following test is not given by aldehydesa) sodium nitroprussideb) benedict solutionc) fehling solutiond) tollens test

24) sodium reacts with alkyl hallides in ether to form alkanes , the reaction is known asa) wurtz synthesisb) Grignard reagentc) nucleophilic substitutiond) none

25) which of the following is the co-factor of carbonic anhydrasea) Fe+2b) Zn+2c) Mg+2d) Co+2

26) which of them is most reactivea) alkaneb) alkenec) alkyned) benzene

27) which electrophile is used in the nitration of benzenea) HNO3b) NO2+c) NO3d) NO2

28) which compound has maximum repulsion with water?a) C6H6b) CH3CH2CH2OHC) C2H5OHD) CH3OCH3

29) rectified spirit contains alcohol abouta) 98%b) 90%c) 95%d) 80%

30) which acid is used in the manufacture of synthetic fibera) formic acidb) oxalic acidc) carbonic acidd) acetic acid

31) which one of the following polymer is addition polymer?a) polystyreneb) polyethylenec) PVCd) all

32) which one is a water soluble vitamina) niacinb) riboflavinc) trypsind) ascorbic acid

33) in primary alcohols carbon atom is attached to carbon attached to ____ carboxyl group?a) 1b) 2c) 3d) none

34) which one of the following is nucleophilea) H2OB) NH3C) BF3D) HCl

35) ethers show phenomenon ofa) position isomerismb) metamerismc) functional group isomerismd) tautemerism

36) synthetic rubber is made by polymerization of a) chloroformb) acetylenec) divinyl acetylened) chloroprene

37)Which of them is most reactive one a)Alkaneb)Alkynec)Alkened)Benzene

38) Which one of the following nucleophilea)H2Ob) BF3c) H2Sd) NH3

39) ketones are prepared by the oxidation ofa) primary alcoholb) secondary alcoholc) tertiary alcohold) none of these

40) which of the following is not a fatty acida) propanoic acidb) acetic acidc) Pthalic acidd) butanoic acid

41) the polymeric substance that is formed in liquid state and then hardened to a rigid solid is called a) rubberb) plasticc) fiberd) varnish

42) hydrogenation of unsaturated oils is done by usinga) finally divided nickelb) finally divided ironc) vanadium pentaoxided) copper

43) the compound with an atom which has an unshared pair of electron is calleda) nucleophileb) electrophilec) protophiled) none of these

44) 1-chloropropane and 2-chloropropane are isomers of each other. The type of isomerism between them isa) Cis-trans isomerismb) chain isomerismc) positional isomerismd) functional group isomerism

45) benzene in presence of ACl3 gives acetophenone when reacts witha) acetyl chlorideb) acetic acidc) ethyl benzened) ethanoic acid

46) the substitution of H group by NO2 group in benzene is calleda) nitrationb) ammonolusisc) sulphonationd) reduction of benzene

47) when purely alcoholic solution of sodium/potassium hydroxide and halogen alkane are refluxed an alkene is formed :CH3-CH2-Br (in presence of alcoholic KOH )--- > CH2=CH2what is the mechanism of the reactiona) elimination b) dehydrationc) debrominationd) nucleophilic substitution

48) organic compound carbon tetra chloride is used as a) lubricantb)solventc) oxidantd) plastic

49) an alcohol is converted into an aldehyde with same number of carbon atoms in the presence of K2CrO4/H2SO4 . the alcohol isa) CH2C(CH)2OHb)CH3CH2CH2OHc)(CH3)3COHd)(CH3)2CHOH

50) consider the following reaction:R-CHO + 2[Ag(NH3))2]OH ----- > RCOONH4 + 2Ag + 2NH3 + H2Othis reaction represents which of the following testsa) Fehling testb) benedict testc) ninhydrin testd) tollens test

51) a polymer in which the number of amino acid residue is greater than 100 or the molecular mass is greater than 10,000 is calleda) proteinb) polypeptidec) dipeptided) tripeptide

52) when hexanedioic acid is heated with hexamethylenediamine the compound formed isa) polypeptideb) esterc) addition polymerd) nylon 6,6

53) glucose and fructose are common example of a) pentosesb) hexosesc) heptosesd) butoses

54) the reaction between fats and caustic soda is calleda) hydrogenolysisb) fermentationc) carboxylationd) saponification

55) macromolecules are defined as large molecules built up from small repeating units calleda) monomersb) isomersc) metamersd) tautomers

56) PVC is an example of a) addition polymerb) condensation polymerc) biopolymerd) thermosetting polymer

57) Terylene, a polyester is an example of a) biopolymerb) lipidsc) condensation polymerd) addition polymer

58) which enzyme is involved in fermentation of glucose?a) zymaseb) invertasec) ureased) diastase

59) relative acidic strength of alcohol , phenol , water and carboxylic acids is a) carboxylic acid > alcohol > phenol > waterb) carboxylic acid > phenol > water > alcoholc) phenol > carboxylic acid > alcohol > waterd) water > phenol > alcohol > carboxylic acid

60) the NH-CO group is called a) amide groupb) amino groupc) protein linkaged) peptide linkage

61) which of the following has an amino R groupa) lysineb) prolinec) valined) alanine

62) At intermediate value of pH , amino acids form zwitter ions containing a) -(N+)H2 and COO+b) NH2 and COO+c) -(N+)H2 and COOHd) NH2 and COOH

64) consider the following reactionCH3COOH + Mg(metal) ----- > ?what product will forma) magnesium formateb) magnesium acetatec) magnesium iond) carboxylate ion

65) CH3CN + HCl ---- > A + B in presence of water in the above reaction A and B area) acetic acid and acid amideb) acetic acid and ammoniac) acetic acid and methyl chlorided) acetic acid and ammonium chloride

66) CH3COOH + PCl5 --- > the products of above reaction area) CH3COCl + POCl2 + HClb) CH3COCl + POCl3 + HClc) CH3Cl + POCl3 + HCld) CH3COCl + POCl3 + H2

67) which of the following compounds belong to homologous series of aldehydesa) HCOClb) HCONH2c) HCOHd) HCOC2H5

68) HCOH + HCN --- > H2COHCNin the above reaction nucleophile isa) CNb) HClc) Cld) OH

69) The formula of mustard gas is:a)(C2H2CI2)2Sb)(C2H4CI2)2Sc)(2H3CI2)2Sd)(C2H4CI)2S70) All compounds or organic excepta)(H2N)2COb)NH4CNOc)CH3NO2d)C2H5N2HSO4

71) tetraethyl lead is used as antiknock agent and is abandoned because of its hazardous product during the combustion of fuel. The hazardous product isa) leadb) CO2c) COd) free radical ethyne ( C2H2)

72) select the correct formula of 2-methyl pentanea) C5H12b) C5H16c) C6H12d) C6H14

73) in reforming process open chain hydrocarbon are converted intoa) polymersb) branched chain hydrocarbonc) ring hydrocarbonsd) branched chain and ring hydrocarbons

74) an organic compound after fusion with sodium gives white precipitate when concentrated nitric acid and then silver nitrate solution was added to filtrate. The compound is likely to bea) CH3CH2CHO b) CH3CH2CH2OHc) CH3CH3COOHd) CH3CH2CH2Br

75) Carbon-Carbon double bond as compared to single bond isa) less susceptible to oxidationb) more susceptible to oxidationc) equally susceptible to oxidationd) all of these

76) which one of the following is a nucleophilea) AlCl3b) CN-c) H3O+d) BF3

77) select the most stable carbonium iona) +CH3b) +CH3-CH2c) (CH3)2HC+d) (CH3)3C+

78) the hydrolysis of an ester proceeds most slowly under conditions of a) high acidityb) high basicityc) neutralityd) high temperature

79) which of the following is the strongest acida) FCH2COOHb) CH3COOHc) ClCH2COOHD) C6H5CH2COOH

80) Iod0f0rm test use for distinguishing?A.isopr0pyl alcohol and methanolb.acetaldhyde and benzeldhydc.2-butan0ne and benzealdyhed.all above

81) which molecular formula indicates 2-methyl pentanea) C5H12b) C4H20c) C6H14d) C6H12

82) how many isomers are possible for pentanea) 2b) 3c) 4d) 5

83) methane can be prepared by the reaction ofa) iodomethane with sodium in dry etherb) methanol with concentrated H2SO4c) sodium methanoate with soda limed) reduction of iodomethane

84) 2,3 dimethyl, 2 butene undergoes catalytic hydrogenation to givea) 2,2 dimethyl butaneb) 2-methyl pentanec) 2,3 dimethyl butaned) 3-methyl pentane

85) the combustion of one mole of propane C3H8 produces how many moles of water?a) 2b) 3c) 4d) 5

86) thermal decomposition of alkanes in the absence of air is calleda) combustionb) oxidationc) crackingd) hydrogenation

87) the dehydrohalogentaion of 2-bromobutane with alcoholic potassium hydroxide gives mainly a) 2-butyneb) 2-butenec) 1-butened) 1-butyne

88) the addition of HX to a double bond the hydrogen goes to the carbon that has more hydrogen is a statement of a) hunds ruleb) morkownikows rulec) huckels ruled) none of the above

89) which of the following compounds on hydrolysis give ethynea) CaC2b) Mg2C3c) Al4C3D) CuCl2

90) When acetylene is passed through hot iron tube at 400 centigrade it givesa) benzeneb) O-xylenec) toluened) polythene

91) which of the following compounds would react rapidly in an SN2 reactiona) (CH3)3Clb) (CH3)2CHIc) CH3CH2Id) CH2=CHI

92) ethylmagnesium iodide reacts with formaldehyde to give products which on acid hydrolysis forma) aldehydeb) primary alcoholc) ketoned) secondary alcohol

93) the compound which reacts most readily with lucas reagent isa) CH3CH2Clb) (CH3)2CHOHc) CH3CH2OHd) (CH3)3COH

94) which of the following alcohols will give a yellow ppt of iodoform with iodine and diluted NaOH solutiona) 1-propanolb) 2-propanolc) 1-butanold) 2-methyl-2-propanol

95) which of the following will not be easily oxidizeda) primary alcoholb) secondary alcoholc) tertiary alcohol d) aldehyde

96) the acid catalyzed dehydration mechanism for alcohol is best described as a/ana) E1b) E2c) SN1d) SN2

97) ethers are considered asa) lewis acidsb) lewis basec) both a and bd) none of these

98) ethanol is isomeric witha) ethanolb) diethyl etherc) dimethyl etherd) propanone

99) which of the following will give a positive test with fehling solutiona) acetic acidb) ethyl acetatec) formaldehyded) acetone

100) which of the following compound on treatment with NaHCO3 will liberate CO2 gasa) acetic acidb) ethyl aminec) ethyl alcohold) phenol

101) acetic acid undergoes reduction with LiAlH4 to givea) ethanalb) ethanec) ethyned) ethanol

102) which of the following is ortho para orienting and ring deactivating ?a) Clb) NH2c) OCH3d) OH

103) phenol is an ortho para directing because the hydroxyl group a) increases the electron density at meta position favouring the nucleophilic attack b) increases the electron density at meta position favouring the electrophilic attack c) increases the electron density at O/P position favouring the nucleophilic attack d) increases the electron density at O/P position favouring the electrophilic attack

104) compared to benzene nitration of toluene takes place ata) same rateb) slower ratec) faster rated) a and b both

105) ethanol is manufactured by fermentation of starch. The starch conversion to maltose requires the enzymea) zymaseb) invertasec) diastased) all