$\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{COOH} \underset{\text { red P }}{\stackrel{\mathrm{Cl}_2}{\longrightarrow}} \mathrm{A} \stackrel{\text { alc. } \mathrm{KOH}}{\longrightarrow} \mathrm{B}$. What is $\mathrm{B}$ ?

• A

  $\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{COCl}$
• B

  $\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{CHO}$
• Correct answer
  C

  $\mathrm{CH}_2=\mathrm{CHCOOH}$
• D

  $\mathrm{ClCH}_2 \mathrm{CH}_2 \mathrm{COOH}$

Hence, the correct answer is option: 'C'.