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CH3CH2COOH reacts with SOCl2 to form CH3CH2COCl. The product reacts with NH3, KOH, and Br2 to form CH3CH2NH2. The correct option is:

1. CH3CH2COOH + SOCl2 → CH3CH2COCl → CH3CH2CONH2 → CH3CH2NH2
2. CH3CH2COOH + SOCl2 → CH3CH2COCl → CH3CH2CONH2 → CH3CH2NH2 + Br2
3. CH3CH2COOH + SOCl2 → CH3CH2COCl → CH3CH2CONH2 → CH3CH2NH2 + KOH
4. CH3CH2COOH + SOCl2 → CH3CH2COCl → CH3CH2CONH2 → CH3CH2NH2 + NH3

Correct answer: CH3CH2COOH + SOCl2 → CH3CH2COCl → CH3CH2CONH2 → CH3CH2NH2

Solution

The reaction sequence involves the conversion of CH3CH2COOH to CH3CH2COCl using SOCl2, followed by the formation of CH3CH2CONH2 with NH3, and finally the Hoffmann bromamide reaction with Br2 and KOH to yield CH3CH2NH2.

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