1.

If heat of hydrogenationof 1,3 - pentadiene and 1,4 - pentadiene are X and Y kcal respectively , heat of hydrogenation of 2,3 - pentadienewill be

Answer»

between X and Y
less thanX as well as Y
greater than X as well as Y
it can'tbe PREDICTED

Solution :Heat of HYDROGENATION is a measure of stability ,more stablean alkene, less is its heatof hydrogenation andvice- versa . Stability of alkadiene followsthe ORDER .
Conjugated diene `gt` Isolated diene ` gt` Cummulativediene (1,3 -pentadiene ) (1,4 - pentadiene) (2,3 - pentadiene )


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