Carboxylic Acids and their Derivatives 2 Question 42
42. Complete the following sequence of reactions with appropriate structures
$$ \begin{array}{r} \mathrm{CH}{3}-\mathrm{CH}{2}-\mathrm{COOH} \xrightarrow[\mathrm{Br}_{2}]{\mathrm{Red}-\mathrm{P}} A \ A \xrightarrow[\text { (ii) } \mathrm{H}^{+} \mathrm{KOH} \text { (excess) }]{\longrightarrow} B \end{array} $$
$(1995,2 M)$
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Solution:
- $\mathrm{CH}{3} \mathrm{CH}{2} \mathrm{COOH} \xrightarrow[\mathrm{Br}{2}]{\text { red- } \mathrm{P}} \underset{A}{\mathrm{CH}{3}}-\underset{\mathrm{Br}}{\mathrm{CH}}-\mathrm{COOH}$ (HVZ reaction)
$$ \xrightarrow[\text { (ii) } \mathrm{H}^{+}]{\text {(i) alc. } \mathrm{KOH}} \mathrm{CH}_{2}=\underset{B}{\mathrm{CH}}-\mathrm{COOH} $$
