2-methylpropane on monochlorination under pho | vedclass

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Question

(C) In $2-$methylpropane, there are $9$ primary hydrogens and $1$ tertiary hydrogen.The relative reactivity of tertiary hydrogen towards chlorination

Vedclass · Accepted Answer

$1-$chloro$-2-$methylpropane as a major product

Vedclass · Answer

(C) In $2-$methylpropane, there are $9$ primary hydrogens and $1$ tertiary hydrogen.The relative reactivity of tertiary hydrogen towards chlorination is about $5.0$ to $5.5$ times that of primary hydrogen.However, the number of primary hydrogens $(9)$ is much greater than the number of tertiary hydrogens $(1)$.Therefore, the statistical factor $(9 	imes 1 = 9)$ outweighs the reactivity factor $(1 	imes 5.5 = 5.5)$.As a result, $1-$chloro$-2-$methylpropane is formed as the major product.

$2-$methylpropane on monochlorination under photochemical conditions gives:

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