Carboxylic Acids and their Derivatives 2 Question 21
22. The reactions, $Q$ to $R$ and $R$ to $S$, are
(a) Aromatic sulfonation and Friedel-Crafts acylation
(b) Friedel-Crafts alkylation and Friedel-Crafts acylation
(c) Friedel-Crafts alkylation, dehydration and Friedel-Crafts acylation
(d) Dehydration and Friedel-Crafts acylation
Passage 2
$P$ and $Q$ are isomers of dicarboxylic acid $\mathrm{C}{4} \mathrm{H}{4} \mathrm{O}{4}$. Both decolourize $\mathrm{Br}{2} / \mathrm{H}_{2} \mathrm{O}$. On heating, $P$ forms the cyclic anhydride.
Upon treatment with dilute alkaline $\mathrm{KMnO}_{4} \cdot P$ as well as $Q$ could produce one or more than one form $S, T$ and $U$.
(2013 Adv.)
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Solution:
- (a)
