Which of the following reactions is not exoth | vedclass

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(D) In the given reactions,we are replacing a $C-H$ bond with a $C-Cl$ bond. For the reaction to be exothermic,the bond dissociation energy of the $C-

Vedclass · Accepted Answer

$CH_3-Cl + CH_2=CH_2 	o CH_4 + CH_2=CHCl$

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(D) In the given reactions,we are replacing a $C-H$ bond with a $C-Cl$ bond. For the reaction to be exothermic,the bond dissociation energy of the $C-H$ bond being broken must be less than the $C-Cl$ bond being formed. In option $D$,the reaction involves the removal of a hydrogen atom from an $sp^2$ hybridized carbon atom in ethene $(CH_2=CH_2)$. The $C-H$ bond in ethene is significantly stronger than the $C-H$ bond in alkanes due to higher $s$-character. Breaking this strong $C-H$ bond requires more energy than is released by forming the $C-Cl$ bond,making the reaction endothermic.

Which of the following reactions is not exothermic?

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