NEETChemistryAmines
Given below are two statements: Assertion (A): N-methylethanamide on treatment with bromine and ethanolic sodium hydroxide gives N-methylmethanamine. Reason (R): Hoffmann bromamide degradation is given only by primary amides. In the light of the above statements, choose the most appropriate answer from the options given below:
Options
- ABoth Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A)
- BBoth Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A)
- CAssertion (A) is true but Reason (R) is false
- DAssertion (A) is false but Reason (R) is true
Correct answer
D. Assertion (A) is false but Reason (R) is true
Step-by-step solution
N-methylethanamide (C H₃ CONHCH₃ ) is a secondary amide. The Hoffmann bromamide degradation reaction is a characteristic reaction of primary amides (R-CONH₂ ) only. Secondary and tertiary amides do not undergo this reaction. Therefore, N-methylethanamide will not undergo degradation with bromine and ethanolic sodium hydroxide to yield N-methylmethanamine. Thus, Assertion (A) is false. Reason (R) correctly states that the reaction is specific to primary amides, which is a true statement. Hence, Assertion (A) is fals