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The decreasing order of bond dissociation energies of C–C, C–H and H–H bonds is

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H - H > - C - H > - C - C

-C - C- > -C - H > H - H

-C - H- > -C - C- > H - H

-C - C- > H - H > - C - H

answer is A.

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Detailed Solution

Atomic size of: H < C
Atomic radius $\propto$ B.L $\propto \frac{1}{Bond enthalpy}$

$∴$ B.E of H-H >C-H > C-C

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