Arrange the following compounds in the order of decreasing tendency towards $S N_{2}$ reaction.

$C H_{3} C H_{2} C H_{2} C l . . . . . . . . . (i)$
$C H_{3} C H_{2} C H C l C H_{3} . . . . . . . (i i)$
$(C H_{3})_{2} C H C H_{2} C l . . . . . . . . (i i i)$
$(C H_{3})_{3} C - C l . . . . . . . . . . (i v)$

i > i i i > i i > i v

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i i i > i v > i i > i

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i i > i > i i i > i v

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i v > i i i > i i > i

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Solution

The correct option is A $i > i i i > i i > i v$
Lesser the bulkiness of an alkyl halide, faster is the substitution by $S N^{2}$ .

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Arrange the following compounds in the order of decreasing tendency towards SN2 reaction. CH3CH2CH2Cl . . . . . . . . . (i) CH3CH2CHClCH3 . . . . . . .(ii) (CH3)2CHCH2Cl . . . . . . . .(iii) (CH3)3C−Cl . . . . . . . . . . (iv)

The correct option is A i> iii> ii >ivLesser the bulkiness of an alkyl halide, faster is the substitution by SN2.

The correct option is A $i > i i i > i i > i v$
Lesser the bulkiness of an alkyl halide, faster is the substitution by $S N^{2}$ .