Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

41.

The reagent in Friedel-Craft's reaction is :

  • pyridine

  • RCOCl

  • RCOOH

  • HCl


42.

Number of isomeric primary amines obtained from C4H11N are :

  • 3

  • 4

  • 5

  • 6


43.

In which of the following reactions carbon-carbon bond formation takes place ?

  • Cannizaro

  • Reimer - Tiemann

  • HVZ reaction

  • Schmidt reaction


44.

Which gives only mono - substituted product ?

  • o - dinitrobenzene

  • m - dinitrobenzene

  • p - dinitrobenzene

  • Nitrobenzene


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45.

Order of boiling point is :

  • HF > HI > HBr > HCl

  • HF > HBr > HI > HCl

  • HCl > HBr > HI > HF

  • HCl > HI > HBr > HF


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46.

Order of hydrolysis for the following :

  • RCOCl

  • RCOOR

  • RCONH2

  • (RCO)2O


A.

RCOCl

In acid derivatives acid chlorides is most reactive , it is vigorously hydrolysed by water .

CH3COCl + H2 CH3COOH + HCl

Acid anhydride is less reactive than acid chlorides .It is hydrolysed slowly by water .

(CH3CO)2O + H2slow 2CH3COOH

The hydrolysis of ethyl acetate in boiling water is slow but inthe presence of acid or alkali the reaction is fast .

CH3CO-OC2H5 + H2H+ CH3COOH + C2H5OH

Amides are hydrolysed by water very slowly .

R-CO||-NH2 + H2H+ R-COOH + NH3

Thus , the correct order of hydrolysis is

RCOCl > (RCO)2O > RCOOR > RCONH2


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47.

If the enolate ion combines with carbonyl group of ester , we get :

  • aldol

  • α , β - unsaturated ester

  • β - keto aldehyde

  • acid


48.

Which of the following compounds will react with NaHCO3  solution to give sodium salt and carbon dioxide ?

  • Acetic acid

  • n - hexanol

  • Phenol

  • Both (b) and (c)


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49.

Which will give chiral molecule ?

  • CH3COCl LiAlH4

  • C2H5CHO H+/H2OCH3MgBr

  • (CH3)2CHC2H5 Cu

  • CH3-CH=C(CH3)2 Cl2


50.

Which is not a polymer?

  • Sucrose

  • Enzyme

  • Starch

  • Teflon


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