Carboxylic Acids and their Derivatives - Result Question 35

####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 $C _4 H _4 O _4$. Both decolourize $Br _2 / H _2 O$. On heating, $P$ forms the cyclic anhydride.

Upon treatment with dilute alkaline $KMnO _4 \cdot P$ as well as $Q$ could produce one or more than one form $S, T$ and $U$.

(2013 Adv.)

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Solution:

  1. (a)


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