it's a normal addition reaction.
CH+CH (ETHYNE) +CH3COOH----> CH2=CHOOCCH3
CH2=CH00CH3 + CH3COOH ------> CH3CH(OOCCH3)2
JUST CH3COOH DISSCIATES INTO IONS AND ADDS TO THE TRIPLE BOND.
CH+CH (ETHYNE) +CH3COOH----> CH2=CHOOCCH3
CH2=CH00CH3 + CH3COOH ------> CH3CH(OOCCH3)2
JUST CH3COOH DISSCIATES INTO IONS AND ADDS TO THE TRIPLE BOND.