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Introduction to Alkenes

Which C-H bon...

Question

Which C-H bond has minimum bond dissociation energy for homolysis

I V

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I I I

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I I

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I

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Solution

The correct option is A $I V$
The bond which forms stable intermediate on breaking the bond has minimum bond dissociation energy.
Here, as shown in the above images $(2)$ is highly stabilized by resonance of radical with double and positive inductive effect of $C H_{3}$ and hyper conjugation of $5$ hydrogen.

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C H_{3} - H

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C H_{3} - H I C H_{3} C H_{2} - H I I C H_{2} = C H - C H_{2} - H I I I C_{6} H_{5} - H I V

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