Which of the following would undergo Hofmann reaction to give a p

Subject

Chemistry

Class

JEE Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

51.

In the reaction, R-X alcoholic KCN A dilute HCl B

The product B is :

  • alkyl chloride

  • aldehyde

  • carboxylic acid

  • ketone


52.

By heating phenol with chloroform in alkali, it is converted into :

  • salicylic acid

  • salicylaldehyde

  • anisole

  • phenyl benzoate


53.

When a mixture of calcium benzoate and calcium acetate is dry distilled, the resulting compound is :

  • acetophenone

  • benzaldehyde

  • benzophenone

  • acetaldehyde


54.

Which of the following does not give benzoic acid on hydrolysis?

  • Phenyl cyanide

  • Benzoyl chloride

  • Benzyl chloride

  • Methyl benzoate


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55.

Which of the following would undergo Hofmann reaction to give a primary amine?

  • R-CO-Cl

  • RCONHCH3

  • RCONH2

  • RCOOR


C.

RCONH2

Hofmann Reaction : In this reaction acid amide group reacts with Br2 in presence of NaOH or KOH to give primary amin e group. The amine is one carbon less than the parent amide. So, the reaction is known as Hofmann degradation reaction.

R-CONH2Acid amide + Br2 + 4KOH  RNH2primary amine + 2KBr +K2CO3+ 2H2O


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56.

Glucose contains in addition to aldehyde group:

  • one secondary OH and four primary OH groups

  • one primary OH and four secondary OH groups

  • two primary OH and three secondary OH groups

  • three primary OH and two secondary OH groups


57.

A distinctive and characteristic functional group of fats is

  • a peptide group

  • an ester group

  • an alcoholic group

  • a ketonic group


58.

At pH = 4, glycine exists as

  • H3N+-CH2- COO-

  • H3N+-CH2- COOH

  • H2N-CH2- COO-

  • H2N-CH2- COOH


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59.

Insulin regulates the metabolism of

  • minerals

  • amino acids

  • glucose

  • vitamins


60.

Acrolein test is positive for:

  • polysaccharides 

  • proteins

  • oils and fats

  • reducing sugars


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