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(A) 1^(@)-Amides react with Br(2) in pre...

(A) `1^(@)`-Amides react with `Br_(2)` in presence of NaOH to form `1^(@)`-amine having one carbon atom less than amide.
(R) It is degradative reduction involving acylnitrene intermediate.

A

If both (A) and ( R) are correct and ( R) is the correct explanation of (A).

B

If both (A) and (R) are correct but (R) is not correct explanation of (A).

C

If (A) is correct but ( R) is incorrect.

D

If (A) is incorrect but ( R) is correct.

Text Solution

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The correct Answer is:
A
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How can you convert an amide into an amine having one carbon atom less than the starting compound?

Assertion : Upon heating an amide with Br_(2)" and "KOH , primary amine with one carbon atom less is formed. Reason : The reaction occurs through occurs through carbene intermediate.

A: In Hofmann's bromamide degradation amines formed containing one carbon atom less than carbon atoms present in amide. R: This reaction occurs through the formation of nitrine intermediate

Hofmann rearrangement In the Hofmann rearrangement an unsubstituted amide is treated with sodium hydroxide and bromide to give a primary amine that has one carbon lesser than starting amide. In the migrating group is chiral then is configuration is retained. Electron releasing effects in the migrating group increases reactivity of Hofmann rearrangement. Arrange the following amides according to their relative when reacted with Br_(2) in excess of strong base :

OP TANDON-CARBOXYLIC ACIDS AND THEIR DERIVATIVES-Objective questions
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  12. Dicarboxylic acids have carboxylic groups e.g. HOOC-COOH,oxalic acid...

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  13. Dicarboxylic acids have carboxylic groups e.g. HOOC-COOH,oxalic acid...

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  14. Dicarboxylic acids have two carboxylic groups, e.g., Acidity of d...

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  15. Dicarboxylic acids have two carboxylic groups, e.g., Acidity of d...

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  16. Dicarboxylic acids have carboxylic groups e.g. HOOC-COOH,oxalic acid...

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  17. Carboxylic acids having at least one alpha-hydrogen react with Cl(2) o...

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  18. Carboxylic acids having at least one alpha-hydrogen react with Cl(2) o...

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  20. Carboxylic acids having atleast one alpha-hydrogen react with Cl(2) or...

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