Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

51.

Consider the following reaction sequence

CH3OH HBr 'A' KCN 'B' H2/ Ni 'C' HNO2 'D'

Choose the correct option regarding the different products obtained in the above reaction sequence:

  • 'D' is an alcohol consisting one carbon more than the starting alcohol

  • Product 'B' is formed via SN2-pathway

  • 'C' is an amine

  • All of the above


D.

All of the above

CH3OH SN2HBr CH3Br (A) SN2KCN CH3CN (B)ReductionH2/ Ni CH3CH2NH2 (C) HNO2 CH3CH2OH (D)

'D' is ethyl alcohol in the above reaction. It consists one carbon atom more than methyl alcohol, the starting alcohol.

'B' is a product formed via SN2 reaction on the treatment CH3Br and KCN.

'C' is ethyl amine formed by the reduction of methyl cyanide.


52.

Which of the following is crossed aldol product in the reaction?

CH3CHO + CH3CH2CHO 25°COH- 'P'


C.

CH3CHO is Acetaldehyde and CH3CH2CHO is Propanal.


53.

Which of the following is an example of carbylamine reaction?

  • 2Ph NH2 + CS2  (ii) conc. HCl(i) KOH Ph- NCS

  • R - NH2 + HNO2 0 - 5°C R - OH + N2 + HCl

  • Ph - NH2 + CHCl3 + 3KOH (alc.)  ph - NC + 3KCl + 3H2O

  • Ph2 - NH + HONO  Ph2 - N - N= O + H2O


C.

Ph - NH2 + CHCl3 + 3KOH (alc.)  ph - NC + 3KCl + 3H2O

Among all the given options, option c is correct. It correctly represents carbylamine reactions. Other option represents

(a) The following reaction represents Hofmann mustard oil reaction:

2Ph - NH2 + S = C = (ii) conc HCl(i) 2KOH Ph - N = C =S + PhNH3Cl-

(b)The following reaction represents Diazotisation reaction:

R - NH2 + HNO2 0 - 5°C R - OH + N2 + HCl

(d) The foloowing reaction represents Lieber mann;s nitroso reaction:

Ph2NH + HONO Ph- N - N = O + H2O


54.

Consider the following compounds

Cl3C - COOH Br3C - COOH I3C - COOH

         (I)                   (II)          (III)

The decreasing order of decarboxylation is

  • I > II > III

  • III > II > I

  • III > I > II

  • II > I > III


A.

I > II > III

-I effect of Cl > Br > I. The decreasing order of stabilities of carbanion is

Cl3C- > Br3C> I3C-

Hence, the decreasing order of ease of decarboxylation is I > II > III.


55.

C3H9N reacts with Hinsberg reagent and the product is insoluble in alkali but soluble in ether. This nitrogen containing compound is

  • primary amine

  • secondary amine

  • tertiary amine

  • methyl isocyanide


B.

secondary amine

C3H9N is a secondary amine.


56.

Sugars are seperated by using the solvent BAW (n-butanol acetic acid -HO) and detected by spraying the plate with

  • aniline hydrogen phthalate solution

  • hydrogen peroxide solution

  • crystals of I2

  • cupric oxide


A.

aniline hydrogen phthalate solution

Ammoniacal silver nitrate solution is used as a spraying reagent for revealing the presence of sugars on filter paper chromatograms.


57.

Which of the following statements is incorrect?

  • Polypropylene is a thermoplastic polymer

  • Melamine-formaldehyde is a thermosetting polymer

  • Mixture of styrene and methyl methacrylate can form ionic addition polymer

  • Low-density polythene is a poor conductor of electricity


C.

Mixture of styrene and methyl methacrylate can form ionic addition polymer

Polystyrene-b-poly (methyl methacrylate) or PS-b-PMMA is usually made by first polymerizing styrene, and then subsequently polymerizing methyl methacrylate (MMA) from the reactive end of the polystyrene chains.


58.

Lauryl alcohol on treatment with H2SO4 followed by neutralisation forms a product which is

  • cationic detergent

  • anionic detergent

  • neutral detergent

  • antidepressant


B.

anionic detergent

(Lauryl alcohol)CH3(CH2)10CH2OH H2SO4 (Lauryl hydrogen sulphate) CH3(CH2)10CH2OSO3NaOH (aq.) (Sodium lauryl sulphate) CH3(CH2)10CH2OSO3Na


59.

Product 'Q' is

  • an amide

  • an amine

  • nitro compound

  • nitrile compound


A.

an amide

Product 'Q' in the above equation is an amide. 


60.

Polypropylene can be obtained by polymerisation of

  • CH2 = CH - CH2 - Cl

  • CH2 = CH - Cl

  • CH3 - Cl

  • CH3 - CHCl2


C.

CH3 - Cl

Polypropylene is produced by the chain growth polymerization of propene.