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Question

The variation in bond dissociation energy of the following compound can be given as:
CH3−HI CH3CH2−HII CH2=CH−CH2−HIII C6H5−HIV

A
I>II>III>IV
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B
IV>III>II>I
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C
IV>I>II>III
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D
II>I>IV>III
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Solution

The correct option is D IV>I>II>III
The bond dissociation energies vary in the order C6H5HIV>CH3HI>CH3CH2HII>CH2=CHCH2HIII.
The bond dissociation energy is minimum for III due to the presence of carbon-carbon double bond.
The bond dissociation energy of benzene is maximum.

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