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At 303 K ethanol has a vapour pressure of about 0.118 atm., acetic acid has the vapour pressure of about 0.039 atm., and ethyl iodide has a vapour pressure of about 0.263 atm. Which of the following represents the correct order of increasing normal boiling point ?

A. CH3COOH<C2H5OH<C2H5I

B. C2H5I<CH3COOH<C2H5OH

C. C2H5I<C2H5OH<CH3COOH

D. C2H5OH<C2H5I<CH3COOH

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