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Question

Which of the following orders is correct for heat of hydrogenation of these compounds?
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A
I>II>III
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B
III>II>I
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C
II>III>I
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D
III>I>II
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Solution

The correct option is A III>II>I
Heat of hydrogenation is the measure of stability of a double bond. Smaller the numerical value of heat of hydrogenation, more stable is the double bond.
In the given compounds, considering the number of αhydrogens, (I) is the most stable with 10αH, followed by (III) with 4 αH. (II) is the least stable with 1αH. Hence, considering numerical value, the order of heat of hydrogenation is: III>II>I

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