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Hyperconjugation

Which of the ...

Question

Which of the following is the correct order for heat of hydrogenation of these compounds?

A

I > I I > I I I

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B

I I > I > I I I

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C

I I > I I I > I

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D

I > I I I > I I

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Solution

The correct option is C $I I > I I I > I$
$I$ has $10$ alpha hydrogens.

$I I$ has $3$ alpha hydrogens.

$I I I$ has $4$ alpha hydrogens.
More the number of alpha hydrogens, more are the number of hyperconjugative structures, higher the stability of alkene and lesser is the heat of hydrogenation value.
Stability order :
$I > I I I > I I$
Heat of hydrogenation value order:
$I I > I I I > I$

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Hyperconjugation

Standard XII Chemistry

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