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  4. What will be the end product (B) in the following sequence of reactions? <img class=img-fluid question-image alt=image src=https://cdn.tardigrade.in/img/question/chemistry/a749856c316cb2124c3580b385cb97da-.png />

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Q. What will be the end product $ (B) $ in the following sequence of reactions?
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AMUAMU 2014Haloalkanes and Haloarenes

Solution:

$KMnO_{4}$ (alkaline) converts the alkyl chain attached directly to benzene nucleus into $—COOK$ group. Hydrolysis converts $—COOK$ into $—COOH $ group i.e., we get a carboxylic acid
The carboxylic acid group when fused with hot sodalime $(NaOH+CaO)$, it gets converted into $—H$ with the removal of $CO_{2}$ gas, (decarboxylation step).
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