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Chemistry · 2023 · 2 marks
CBSE 2023 · Region 1 · Set 1 · Q23
(a) Account for the following: (i) Phenol is a stronger acid than an alcohol. (ii) The boiling point of alcohols decreases with increase in branching…
(a)
Account for the following:
(i)
Phenol is a stronger acid than an alcohol.
(ii)
The boiling point of alcohols decreases with increase in branching of alkyl chain.
OR
(b)(i)
Write the mechanism of the following reaction: \[\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{OH} \xrightarrow[443 \mathrm{~K}]{\mathrm{H}^{+}} \mathrm{CH}_{2}=\mathrm{CH}_{2}+\mathrm{H}_{2} \mathrm{O} \]
(ii)
Write the equation involved in Reimer-Tiemann reaction.
Marking-scheme solution
(a)
(i) Because phenoxide ion is more stable due to resonance than alkoxide ion.
(ii) Because branching decreases the surface area / the van der Waals force decreases with a decrease in surface area.
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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.