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In the pair, (CH_(3))_(3)C Cl and CH_(3)Cl, CH_(3)Cl will react faster in S_(N)2 reaction with OH^(-). Explain. |
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Answer» Solution :In `S_(N)2` reactions, reactivity depends upon the steric hindrance. In `(CH_(3))_(3)C CL`, the `ALPHA`-carbon carrying the Cl atom is attached to three `CH_(3)` groups but in `CH_(3)-Cl`, the carbon carrying the Cl atom is attached to three hydrogen atoms. since `CH_(3)` group is MUCH bigger than H-atoms, therefore, `(CH_(3))_(3)C Cl` suffers GREATER steric hindrance to nucleophilic attack by `OH^(-)` than `CH_(3)Cl` and hence `CH_(3)Cl` will react faster than `(CH_(3))_(3)C Cl` in `S_(N)2` reaction with `OH^(-)`. `underset("Methyl chloride (carbon carrying Cl atom is attached to three small H-atoms, no steric hindrance, more reactive)")(CH_(3)-Cl)""underset("tert-Butyl chloridee (Carbon carrying Cl atom is attached to three bigger "CH_(3)" groups, more steric hindrance, less reactive)")((CH_(3))_(3)C-Cl)` |
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