Which of the following reaction is most exothermic?

Propane

+ C l_{2} / h v \to 2 -

chloropropane

+ H C l

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Propane

+ B r_{2} / h v \to 2 -

bromopropane

+ H B r

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Isobutane

+ C l_{2} / h v \to t -

butyl chloride

+ H C l

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Isobutane

+ B r_{2} / h v \to t -

butyl chloride

+ H B r

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Solution

The correct option is D Isobutane $+ C l_{2} / h v \to t -$ butyl chloride $+ H C l$
Iso butane reacts with chlorine in the presence of light to form t-butyl chloride is an exothermic reaction.
This reaction occur through most stable tertiary free radical, then $C - C l$ bond is formed. $C - C l$ bond is more stronger than $C - B r$ bond. So this reaction is most exothermic reaction.
$C H_{3} C H (C H_{3})_{2} + C l_{2} / h v \to C H_{3} C^{.} (C H_{3})_{2} \to C H_{3} C l C (C H_{3})_{2}$

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