Question

Decreasing order of heat of hydrogenation

Answer 1

Answer:

Decreasing order of heat of hydrogenation

Explanation:

More stable the alkene, less is the heat of hydrogenation. Among the given alkene, 2 is most stable as it is stabilized through hyperconjugation by 8 alpha-hydrogens. In case of 3 and 4, the number of alpha hydrogen 6, whereas for 1 has the least alpha hydrogen equal to 2. Hence heat of hydrogenation will be maximum for 1.

Between 3 and 4, 4 will have higher heat as it has a net dipole moment whereas 4 has zero dipole moment.

Hence, the required order is- 1>4>3>2

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