(A) : NaCl in water and organic acids in benzene show abnormal molecular mass.
(R) : Abnormal molecular mass is obtained when the substance in the solution undergoes either dissociation or association.

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Both (A) and (R) are true and (R) is not the correct explanation of (A)

(A) is true but (R) is false

Both (A) and (R) are true and (R) is the correct explanation of (A)

Both (A) and (R) are false

answer is A.

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Detailed Solution

Vant Hoff factor can be defined as:
i = $\frac{N o r m a l m o l a r m a s s}{A b n o r m a l m o l a r m a s s}$ --(1)
NaCl in water dissociates to Na⁺ and Cl^-, thus forming two resultant ions giving out i = 2.
Using (1), Normal molar mass of NaCl = 2 * Abnormal molar mass of NaCl.Therefore, assertion can be concluded to be true.Similarly, acetic acid dimerizes in benzene thus forming an association compound.
Thus, reasoning can also be concluded to be true.
Hence, correct option is: (A) Both (A) and (R) are true and (R) is the correct explanation of (A)