$\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{COOH} \underset{\text { red P…

$\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{COOH} \underset{\text { red P }}{\stackrel{\mathrm{Cl}_2}{\longrightarrow}} \mathrm{A} \stackrel{\text { alc. } \mathrm{KOH}}{\longrightarrow} \mathrm{B}$. What is $\mathrm{B}$ ?
  1. $\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{COCl}$
  2. $\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{CHO}$
  3. $\mathrm{CH}_2=\mathrm{CHCOOH}$
  4. $\mathrm{ClCH}_2 \mathrm{CH}_2 \mathrm{COOH}$

Asked in: JEE Main 2002

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