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Question
Assertion :Ph−CH3O undegoes nitration faster than Ph−S−CH3. Reason: CH3O− group has greater -I effect then CH3−S− group.
Assertion :Ph−CH3O undegoes nitration faster than Ph−S−CH3. Reason: CH3O− group has greater -I effect then CH3−S− group.
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Solution
The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
Ph−CH3Oundergoes nitration faster than Ph−S−CH3. Due to electronegativity difference, CH3−O− group has greater -I effect than CH3−S− group Real reason: The π bond from O to the ring carbon makes the bond distance shorter and stronger than a comparable bond from S atom to the ring carbon. Hence, because of greater +M effect of CH3−O− group, nitration is faster in Ph−CH3O than in Ph−S−CH3.
Ph−CH3Oundergoes nitration faster than Ph−S−CH3. Due to electronegativity difference, CH3−O− group has greater -I effect than CH3−S− group
Real reason: The π bond from O to the ring carbon makes the bond distance shorter and stronger than a comparable bond from S atom to the ring carbon. Hence, because of greater +M effect of CH3−O− group, nitration is faster in Ph−CH3O than in Ph−S−CH3.
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