Dipole moments of four methyl halides is 1.636D, 1.847D, 1.83D, 1.86D. Methyl fluoride has a dipole moment of
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a
1.86 D
b
1.847 D
c
1.83 D
d
1.636 D
answer is B.
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Detailed Solution
Expected dipole moment based on C - X polarityCH3F>CH3Cl>CH3Br>CH3IBut μ=eÃdcumulative effect of bond polarity and C - X bond length is maximum for CH3Cl.CâCl bond is much longer than C - F bondâ´ Experimentally μ for CH3Cl1.86D>CH3F1.847D>CH3Br1.83D>CH3I1.636D