Carboxylic Acids and their Derivatives 2 Question 7
7. The major product of following reaction is
$$ R-\mathrm{C} \equiv \mathrm{N} \xrightarrow[\text { (ii) } \mathrm{H}{2} \mathrm{O}]{\text { (i) } \mathrm{AIH}(i \cdot \mathrm{Bu}){2}} ? $$
(a) $\mathrm{RCHO}$
(b) $\mathrm{RCONH}_{2}$
(c) $\mathrm{RCOOH}$
(d) $\mathrm{RCH}{2} \mathrm{NH}{2}$
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Answer:
Correct Answer: 7. (d)
Solution:
- Key Idea DIBAL-H is diisobutyl aluminium hydride, $\left[\left(\mathrm{CH}{3}\right){2} \mathrm{CHCH}{2}\right]{2} \mathrm{AlH}$. It is a selective reducing agent. It reduces carboxylic acids, carboxylic acid derivatives and nitriles into aldehydes. It is an electrophilic reducing agent.
The mechanism of the reaction is as follows:
So, $R-\underset{\mathrm{O}}{\mathrm{C}} \mathrm{H}$ is the correct answer.
