Ncert Exercises & Solutions

Select the correct option based on statements below:

Assertion (A):	It is difficult to replace chlorine with -OH in chlorobenzene in comparison to that in chloroethane.
Reason (R):	Chlorine carbon (—Cl) bond in chlorobenzene has a partial double bond character due to resonance.

1.	Both (A) and (R) are true and (R) is the correct explanation of (A).
2.	Both (A) and (R) are true but (R) is not the correct explanation of (A).
3.	(A) is true but (R) is false.
4.	(A) is false but (R) is true.

Hint: Cl shows a resonance effect when attach to the benzene ring.

It is difficult to replace chlorine with -OH in chlorobenzene in comparison to that in chloroethane because due to resonance Chlorine-carbon (C—Cl) bond in chlorobenzene has a partial double bond character. It is difficult to break a double bond then single bond.

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