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Which one of the following is not a proper trend

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a
CH3F > CH3Cl > CH3Br > CH3I ….. Dipole moment
b
n-C3H7 I>n- C3H7Br>n- C3H7Cl …… Density
c
C3H7Br > C2H5Br > CH3Br …….. Boiling Point
d
para > ortho > meta (dichlorobenzene derivatives) …. Melting point

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detailed solution

Correct option is A

Dipole Moment of CH3Cl > CH3F > CH3Br > CH3I;Though C–F bond is more polar than C–Cl bond, C–Cl bond is longer than C–F bond;  The  cumulative effect of (e x q) is higher for CH3Cl.

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