When 1-pentyne ( ) is treated with alcoholic KOH at

CHEMISTRY · Subjective · CBSE · Chemistry · Hydrocarbons · Hydrocarbons

Problem

When 1-pentyne (

A

) is treated with

4N

alcoholic KOH at

175^\circ\text{C}

, it is converted slowly into an equilibrium mixture of 1.3% 1-pentyne (

A

), 95.2% 2-pentyne (

B

) and 3.5% of 1,2-pentadiene (

C

). The equilibrium was maintained at

175^\circ\text{C}

. Calculate

\Delta G^\circ

for the following equilibria :

B = A \quad ; \quad \Delta G_1^\circ = ?

B = C \quad ; \quad \Delta G_2^\circ = ?

From the calculated value of

\Delta G_1^\circ

and

\Delta G_2^\circ

indicate the order of stability of (

A

), (

B

) and (

C

). Write a reasonable reaction mechanism showing all intermediates leading to (

A

), (

B

) and (

C