One molal solution of a carboxylic acid in benzene shows the elevation of boiling point of 1.518 K. The degree of association for dimerization of the acid in benzene is (Kb for benzene = 2.53 K kg mol-1) :

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answer is D.

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Detailed Solution

ΔTb( normal )=K↓m=2.53×1=2.53K;i=ΔT(̸ cbs )ΔTb( nor )=1.5182.53=0.6i=1−1−1nα; α=0.8

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