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Question:

Butyne on oxidation with hot alkaline KMnO4 gives:

CH3CH2CH2COOH

CH3CH2COOH

CH3CH2COOH+CO2+H2O

CH2CH2COOH+HCOOH

Solution:

C≡C-C
KMnO4
→ CH2CH2COOH + HCOOH