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Which of the followig dienes has lowest heat of hydrogenation?

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Which of the followig dienes has lowest heat of hydrogenation?
A. `CH_(3)CH_(2)-CH=C=CH_(2)`
B. `CH_(2)=C=CH-CH_(3)`
C. `CH_(2)=CH-CH=CH_(2)`
D. `CH_(2)=CH-CH_(2)-CH=CH_(2)`
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Correct Answer - C
Conjugated dienes are stablised by the delocalisation of four `pie` electron. And hence have lowest heats of hydrogenation among the various types of diences.
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