Among the following the most reactive towards alcoholic $\mathrm{KOH}$ is

Among the following the most reactive towards alcoholic $\mathrm{KOH}$ is
  1. $\mathrm{CH}_2=\mathrm{CHBr}$
  2. $\mathrm{CH}_3 \mathrm{COCH}_2 \mathrm{CH}_2 \mathrm{Br}$
  3. $\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{Br}$
  4. $\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{CH}_2 \mathrm{Br}$.

Solution

In alkyl halides, polarity of $\mathrm{C}-\mathrm{Br}$ bond increases with increase in chain length.

Asked in: NEET 2009 (Mains)

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