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.
(a) Assertion and reason both are correct and reason is correct explanation of assertion.
(b) Assertion and reason both are wrong statements.
(c) Assertion is correct statement but reason is wrong statement.
(d) Assertion is wrong statement but reason is correct statement.
(e) Both assertion and reason are correct statements but reason is not correct explanation of assertion.

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Assertion: pH of HCl solution is less than that of acetic acid of the some concentrationReason: In equimolar solution, the number of titrable protons present in HCI is less than that present in acetic acid

The correct option is D Assertion is correct but Reason is incorrect(A) is correct because HCl is a strong electrolyte resulting in higher [H⊕] (and less pH) then acetic acid.(R) is wrong, HCl will produce more protons than acetic acid at same concentration.

Assertion: pH of HCl solution is less than that of acetic acid of the some concentration
Reason: In equimolar solution, the number of titrable protons present in HCI is less than that present in acetic acid

The correct option is D Assertion is correct but Reason is incorrect
(A) is correct because HCl is a strong electrolyte resulting in higher $[H^{\oplus}]$ (and less pH) then acetic acid.
(R) is wrong, HCl will produce more protons than acetic acid at same concentration.