The product$(s)$ in the following sequence of reactions will be: $Me-C \equiv C-Me \xrightarrow[2. \text{dil. alkaline } KMnO_4]{1. Na/NH_3(liq.), \text{ethanol}, -33^\circ C}$ Product$(s)$

  • A
    Meso-butane$-2,3-$diol
  • B
    $(2R, 3R)$-butane$-2,3-$diol
  • C
    Racemic mixture of butane$-2,3-$diol
  • D
    $(2S, 3S)$-butane$-2,3-$diol

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Hardening of oil is done by

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