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Which one of the following compounds would have the highest heat of hydrogenation?

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Which one of the following compounds would have the highest heat of hydrogenation?

(a) CH2 = CH2

(b) CH3 - CH2 - CH = CH2

(c) CH3CH = CHCH3

(d) (CH3)2C = C(CH3)2

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Correct answer: (a) CH2 = CH2

Explanation:

The heat of hydrogenation of an alkene depends upon its stability. Higher the stability, lower the heat of hydrogenation. Since CH2 = CH2 has no substituent, it is the least stable alkene and hence has the highest heat of hydrogenation

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