Addition of 0.223g of phenyl acetic acid (C6H5CH2COOH) to 4.4g of benzene decreases the freezing point of benzene by 0.830C. It shows (kf = 5.12 k kg mol–1)

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phenyl acetic acid exists as such in benzene

phenyl acetic acid undergoes partial ionization in benzene

phenyl acetic acid undergoes complete ionization in benzene

phenyl acetic acid dimerises in benzene

answer is D.

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Detailed Solution

GMW of C6H5CH2COOH= 136gWt. of C6H5CH2COOH =0.223gWt. of solvent(Benzene) = 4.4gKf = 5.12oKgmole-1i = 0.435 i<1Phenyl acetic acid associates in Benzene

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