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Name of the reduction of C=O to CH2 by Zn-Hg and conc. HCl (Clemmensen)

The same question, asked 3 times: May 2021 S1, 16 May 2023 S2, 12 May 2026 S1. Every wording below, oldest first.

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  1. Question 1

    May 2021 S1

    89
    Identify the reaction in which the carbonyl group of aldehydes and ketones is reduced to a methylene group on treatment with zinc-amalgam and conc. HCl.

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  2. Question 2

    16 May 2023 S2

    78
    Identify name of reaction when aldehyde or ketone react with Zn-Hg/conc. HCl to give alkane.

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  3. Question 3

    12 May 2026 S1

    40
    C=O+4[H]→ΔZn−Hg, conc. HCl−CH2+H2O\mathrm{C = O + 4[H] \xrightarrow[\Delta]{Zn{-}Hg,\ conc.\ HCl} {-}CH_2 + H_2O} (Carbonyl group in aldehydes and ketones) (Methylene group) Identify the name of above reaction.

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