1–Butyne on reaction with hot alkaline $KMn{O}_4$ followed by acidification gives?

• A

  ${\text{CH}}_{\text{3}}{\text{CH}}_{\text{2}}\text{COOH}$

• B

  ${\text{CH}}_{\text{3}}{\text{CH}}_{\text{2}}{\text{CH}}_{\text{2}}\text{COOH}$

• C

  ${\text{CH}}_{\text{3}}{\text{CH}}_{\text{2}}\text{COOH + HCOOH}$

• D

  ${\text{CH}}_{\text{3}}{\text{CH}}_{\text{2}}{\text{COOH + CO}}_{\text{2}}$