Which of the following is the correct order for bond energy for $C - H$ bonds in these compounds?

Y > Z > X

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X > Z > Y

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X > Y > Z

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Z > X > Y

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Solution

The correct option is C X > Y > Z
$C - H bond energy \propto \frac{1}{Stability of free radical}$

Free radical formed from X is a primary free radical and is the least stable.
Free radical formed from Y is a allylic free radical hence it is more stable than the free radical from X.
Free radical formed from Z is a allylic free radical with extended conjugation and hence it is most stable free radical.

So, the order of stability of free radical: Z > Y > X
Hence $C H$ bond energy follow the same i.e., X > Y > Z

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