Q 1349323213.     The freezing point of `0.02` mole fraction solution of acetic acid in benzene is `277.4` K. Assuming molality equal to molarity,calculate `K_c ` for the equilibrium reaction `2CH_3COOH ⇋ (CH_3COOH)_2.` Given : `T_f(benzen e) =278.4` and `K_f(benzen e)=5.0K kg mol^{-1}`.

A

`4.794` `M^{-1}`

B

`3.994` `M^{-1}`

C

`3.794` `M^{-1}`

D

`2.794` `M^{-1}`

HINT

Use formula: `- Delta T_f=K_fm`

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