Q.

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Which of following orders is correct for heat of hydrogenation of these compounds?

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a

III>I>II

b

I>II>III

c

II>III>I

d

III>II>I

answer is C.

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Detailed Solution

Heat evolved when any unsaturated hydrocarbon is hydrogenated is called heat of hydrogenation (H) . If alkene is more reactive towards hydrogen then it will evolve more heat is evolved.

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