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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a
phenyl acetic acid exists as such in benzene
b
phenyl acetic acid undergoes partial ionization in benzene
c
phenyl acetic acid undergoes complete ionization in benzene
d
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