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Preparing an alkyl halide from an alcohol (reagent or product)

This type of question, asked 3 times: 3 May 2023 S2, 12 May 2026 S1, 19 May 2026 S2. All 3 questions below, oldest first.

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  1. Question 1

    3 May 2023 S2

    84
    Identify compound Q in following reaction. R-OH+Q→R-Cl+HCl+POCl3R\text{-}OH + Q \rightarrow R\text{-}Cl + HCl + POCl_3

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  2. Question 2

    12 May 2026 S1

    39
    Which of the following reactions is NOT used for preparation of alkyl halide?

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  3. Question 3

    19 May 2026 S2

    40
    Propene reacts with diborane in the presence of THF followed by H2O2\mathrm{H_2O_2} in alkaline medium to give compound A. Compound A reacts with phosphorous pentachloride to give compound B. Identify compound B.

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