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One molal solution of a carboxylic acid ...

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 `(K_b` for benzene `= 2.53 K kg mol^-1)` :

A

`60%`

B

`70%`

C

`75%`

D

`80%`

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