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Methyl magnesium bromide with dry ice, then hydrolysis: product

The same question, asked 2 times: 9 May 2024 S1, 22 Apr 2025 S1. Every wording below, oldest first.

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  1. Question 1

    9 May 2024 S1

    70
    Identify the product 'B' in the following reaction. CH3MgBr→dry iceA→H2O/dil. HClBCH_3MgBr\xrightarrow{\text{dry ice}}\text{A}\xrightarrow{H_2O/dil.\,HCl}B

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  2. Question 2

    22 Apr 2025 S1

    97
    Identify the product ' BB ' in following reaction. Dry ice → dry ether CH3MgBrA→H3O+B\xrightarrow[\text{~dry ether~}]{CH_{3}MgBr}A\xrightarrow{H_{3}O^{+}}B

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