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A compound 'X' on treatment with Br2/NaOH, provided C3H9N, which gives positive carbylamine test. Compound 'X' is: (1) CH3CH2CH2CONH2 (2) CH3CON(CH3)2 (3) CH3CH2COCH2NH2 (4) CH3COCH2NHCH3

1. CH3CH2CH2CONH2
2. CH3CON(CH3)2
3. CH3CH2COCH2NH2
4. CH3COCH2NHCH3

Correct answer: CH3CH2COCH2NH2

Solution

The correct option, CH3CH2COCH2NH2, is a primary amine that can be converted to an isocyanide upon treatment with Br2/NaOH, which then gives a positive carbylamine test. This reaction is characteristic of primary amines, confirming that this compound is the source of C3H9N.

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