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JEE Advanced levelSingle correct optionDifficulty 3 of 3cb153

Assertion (A): has a smaller dipole moment than although fluorine is more electronegative than hydrogen. Reason (R): In the resultant of the N-F bond dipoles opposes the dipole due to the lone pair on nitrogen.

  1. ABoth A and R are true and R is the correct explanation of A
  2. BBoth A and R are true but R is not the correct explanation of A
  3. CA is true but R is false
  4. DA is false but R is true

Answer: A

In , the N-H bond dipoles (towards N) and the lone pair dipole point the same way and add. In the N-F dipoles point towards F, opposing the lone pair dipole, so the net moment is small. Both statements are true and R explains A.
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