Tertiary alkyl halide is practically inert to | vedclass

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(D) In $S_{N}2$ reactions,the nucleophile attacks the carbon atom bearing the leaving group from the backside.In tertiary alkyl halides,the central ca

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Steric hindrance

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(D) In $S_{N}2$ reactions,the nucleophile attacks the carbon atom bearing the leaving group from the backside.In tertiary alkyl halides,the central carbon is surrounded by three bulky alkyl groups.These bulky groups create significant $steric 	ext{ } hindrance$,which blocks the path of the incoming nucleophile.Due to this,the rate of $S_{N}2$ reaction is extremely low for tertiary alkyl halides.Therefore,the order of reactivity for $S_{N}2$ mechanism is $1^{\circ} > 2^{\circ} > 3^{\circ}$.

Tertiary alkyl halide is practically $inert$ to substitution by $S_{N}2$ mechanism because of:

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