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Rearrange the followig in order of incre...

Rearrange the followig in order of increasing ease of dehydrogenation:
`CH_(3)CH_(2)CH_(2)Cl,CH_(3)CHClCH_(3),CH_(3)C Cl(CH_(3))_(2)`. ltBrgt Give reason.

Text Solution

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The increasing ease of dehydrohalogenation follows the order:
.
Reason: According to Saytzeff's rule, the more alkylated alkene is more stable and is formed in preference to less alkylated alkene. Now, tertiary alkyl halide will form the maximum alkylated alkene while primary will yield the least alkylated alkene. therefore, the tertiary alkyl halide is maximum reactive while primary is the least reactive or relative order of reactivity is justified.
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Knowledge Check

  • Arrange the following in order of decreasing reactivity towards S_(N^(2)) reactions: CH_(3)CH_(2)CH_(2)Cl(I),CH_(3)CH_(2)-CHCl-CH_(3)(II)(CH_(3))_(2)CHCH_(2)Cl(III),(CH_(3))_(3)C-Cl(IV)

    A
    IgtIIIgtIIgtIV
    B
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    C
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    D
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