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Chemistry · PYQ NEET UG 2025
हिन्दीThe major product of the following reaction is : \( \begin{array}{c} \text{O} \\ \parallel \\ \text{C-CH}_2-\text{CN} \end{array} \xrightarrow[\text{(ii) } \text{H}_3\text{O}^+]{\text{(i) } \text{CH}_3\text{MgBr (excess)}} \)
Correct answer · Option 3
\( \begin{array}{c} \text{OH} \\ | \\ \text{C}-\text{CH}_2-\text{C}-\text{CH}_3 \\ | \quad \quad | \\ \text{CH}_3 \quad \text{OH} \\ \quad \quad \text{CH}_3 \end{array} \)
Explanation
Excess Grignard reagent reacts with both the ketone group and the nitrile group. The ketone gives a tertiary alcohol, and the nitrile gets converted into a ketone intermediate which further reacts with another molecule of \( \text{CH}_3\text{MgBr} \) followed by hydrolysis to yield a diol.
