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Grignard reagent with an ester: moles used and the tertiary alcohol

This type of question, asked 2 times: 2021 Paper 11, 2021 Paper 21. All 2 questions below, oldest first.

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  1. Question 1

    2021 Paper 11

    26
    How many equivalents of CH3MgBrCH_{3}MgBr to make 2-methylpropan-2-ol from ethyl ethanoate?

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  2. Question 2

    2021 Paper 21

    33
    Given below are two statements: Statement I: Ethyl pent-4-yn-oate on reaction with CH3MgBrCH_{3}MgBr gives a 3∘3^{\circ}-alcohol. Statement II: In this reaction one mole of ethyl pent-4-yn-oate utilizes two moles of CH3MgBrCH_{3}MgBr. In the light of the above statements, choose the most appropriate answer from the options given below:

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