(A) : The molecular mass of acetic acid in benzene is more than the actual value of the solute.
(R) : Molecules of acetic acid dimerize in benzene due to hydrogen bonding.

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(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

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

answer is A.

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Detailed Solution

Explanation: Due to hydrogen bonds between its molecules, acetic acid (molar mass 60 g/mol) dimerizes in benzene, causing the molecular weight to double from its initial value.
As a result, the molecular weight of benzene acetic acid is 120 g/mo.
Therefore, the correct option is (A) Both (A) and (R) are true and (R) is the correct explanation of (A).

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