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Arrangement of $\left(\mathrm{CH}_3\right)_3-\mathrm{C}-,\left(\mathrm{CH}_3\right)_2-\mathrm{CH}-, \mathrm{CH}_3-\mathrm{CH}_2$ - when attached to benzyl or an unsaturated group in increasing order of inductive effect is
ChemistryGeneral Organic ChemistryJEE MainJEE Main 2002
Options:
  • A
    $\left(\mathrm{CH}_3\right)_3-\mathrm{C}- < \left(\mathrm{CH}_3\right)_2-\mathrm{CH}- < \mathrm{CH}_3-\mathrm{CH}_2$
  • B
    $\mathrm{CH}_3-\mathrm{CH}_2- < \left(\mathrm{CH}_3\right)_2- < \mathrm{CH}- < \left(\mathrm{CH}_3\right)_3-\mathrm{C}-$
  • C
    $\left(\mathrm{CH}_3\right)_2-\mathrm{CH}- < \left(\mathrm{CH}_3\right)_3-\mathrm{C}- < \mathrm{CH}_3,-\mathrm{CH}_2$
  • D
    $\left(\mathrm{CH}_3\right)_3-\mathrm{C}- < \mathrm{CH}_3-\mathrm{CH}_2-\left(\mathrm{CH}_3\right)_2-\mathrm{CH}-$
Solution:
2849 Upvotes Verified Answer
The correct answer is:
$\mathrm{CH}_3-\mathrm{CH}_2- < \left(\mathrm{CH}_3\right)_2- < \mathrm{CH}- < \left(\mathrm{CH}_3\right)_3-\mathrm{C}-$
$\mathrm{CH}_3$ group has $+\mathrm{I}$ effect, as number of $-\mathrm{CH}_3$ group increases, the inductive effect increases.

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