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Which of the following has highest boiling point?

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Which of the following has highest boiling point?

(A) C2H5-F

(B) C2H5-Cl

(C) C2H5-Br

(D) C2H5-I

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Option : (D) C2H5-I

The boiling points of C2H5 - X (ethyl halide) increases down the group due to increase in the Vander waals forces of attraction with the increases in the size and mass of halogen atom.

Hence,

C2H5I has highest boiling point.

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