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The freezing point of benzene decreases by $0.45^{\circ}C$ when $0.2\; g$ of acetic acid is added to $20 \;g$ of benzene. If acetic acid associates to form a dimer in benzene, percentage association of acetic acid in benzene will be : $(K_f$ for benzene = $5.12\; K \;kg\; mol^{–1} )$

( A ) 94.6 %
( B ) 74.6 %
( C ) 64.6 %
( D ) 80.4 %

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