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Grignard reagent with a nitrile gives a ketone

This type of question, asked 2 times: 2021 Paper 15, 25 Jul 2022. All 2 questions below, oldest first.

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  1. Question 1

    2021 Paper 15

    41
    Benzonitrile is treated with CH3MgBr{CH}_{3}MgBr and then H3O+H_{3}O^{+} to give X. X shows a positive:

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  2. Question 2

    25 Jul 2022

    136
    CH3−CH2−CN→CH3MgBr, EtherA→H3O+B→Zn−Hg/HClCCH_{3}-CH_{2}-CN \xrightarrow{CH_{3}MgBr,\ \text{Ether}} A \xrightarrow{H_{3}O^{+}} B \xrightarrow{Zn-Hg/HCl} C. The correct structure of CC is:

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