Q9 / 150 · MHT CET 2024 (03 May Shift 2) · Chemistry

Which from following molecules exhibits lowest dipole moment?

  • A
    $\mathrm{CH}_3 \mathrm{~F}$
  • B
    $\mathrm{CH}_3 \mathrm{Cl}$
  • C
    $\quad \mathrm{CH}_3 \mathrm{Br}$
  • Correct answer
    D
    $\quad \mathrm{CH}_3 \mathrm{I}$

Solution

As the electronegativity of halogen decreases down the group, the $\mathrm{C}-\mathrm{X}$ bond dipole moment decreases. Therefore, the dipole moment order is: $\mathrm{CH}_3 \mathrm{~F}\gt\mathrm{CH}_3 \mathrm{Cl}\gt\mathrm{CH}_3 \mathrm{Br}\gt\mathrm{CH}_3 \mathrm{I}$

Hence, the correct answer is option: 'D'.

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