Ncert Exercises & Solutions

Select the correct option based on statements below:

Assertion (A):	o-Nitrophenol is less soluble in water than the m and p-isomers.
Reason (R):	m and p-Nitrophenols exist as associated molecules.

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: o-Nitrophenol shows intramolecular hydrogen bonding

Due to the presence of intramolecular hydrogen bonding, o-nitrophenol does not form hydrogen bonds with

H_{2} O

but m and p-nitrophenol form hydrogen bonds with water. Thus, o-nitrophenol is less soluble in water.

m and p-Nitrophenols exist as associated molecules because of intermolecular hydrogen bonding. Hence, both Assertion and Reason are true and Reason is not the correct explanation of Assertion.

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