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Chemistry · 2023 · 3 marks
Haloalkanes and HaloarenesChemical Reactions of Haloalkanes and Haloarenes3 marksUnderstandshort answer
CBSE 2023 · Region 4 · Set 1 · Q27
Account for the following: (a) Benzyl chloride is highly reactive towards S_N 1 reaction. (b) (±)-Butan-2-ol is optically inactive, though it…
Account for the following :
(a)
Benzyl chloride is highly reactive towards $\displaystyle \mathrm{S}_{\mathrm{N}} 1$ reaction.
(b)
(±)-Butan-$\displaystyle 2$-ol is optically inactive, though it contains a chiral carbon atom.
(c)
Chloroform is stored in closed dark coloured bottles.
Marking-scheme solution
(a) Due to the resonance stabilisation of benzyl carbocation.
(b) Because it is a racemic mixture / it contains an equimolar mixture of the two enantiomers of Butan-$\displaystyle 2$-ol.
(c) Because it forms a poisonous gas phosgene in presence of air and light.
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CBSE Class 12 Chemistry past-paper question from the 2023 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.