Q6 / 225 · JEE Main 2002 · Chemistry

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

  • A
    $\left(\mathrm{CH}_3\right)_3-\mathrm{C}- < \left(\mathrm{CH}_3\right)_2-\mathrm{CH}- < \mathrm{CH}_3-\mathrm{CH}_2$
  • Correct answer
    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

$\mathrm{CH}_3$ group has $+\mathrm{I}$ effect, as number of $-\mathrm{CH}_3$ group increases, the inductive effect increases.

Hence, the correct answer is option: 'B'.

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