In the following reaction order, $B$ is

In the following reaction order, $B$ is

1. $\mathrm{CH}_2=\mathrm{CH}-\mathrm{COOH}$
2. 
   
3. $\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{COBr}$
4. $\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{OH}$

Solution

$\mathrm{P}+\mathrm{Br}_2$ is brominating agent that brominates the $\alpha$-position. The product then undergo dehydrohalogenation in the presence of alcoholic potassium hydroxide.

Asked in: NEET 2010 (Screening)

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