Consider the following:Assertion (A): Dipole | vedclass

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(A) In $NH_3$,the nitrogen atom is more electronegative than hydrogen. The dipole moments of the three $N-H$ bonds point towards the nitrogen atom,and

Vedclass · Accepted Answer

Both $(A)$ and $(R)$ are correct and $(R)$ is the correct explanation of $(A)$.

Vedclass · Answer

(A) In $NH_3$,the nitrogen atom is more electronegative than hydrogen. The dipole moments of the three $N-H$ bonds point towards the nitrogen atom,and the dipole moment of the lone pair also points in the same direction. Thus,they add up to give a large net dipole moment $(1.46 \ D)$.In $NF_3$,fluorine is more electronegative than nitrogen. The dipole moments of the three $N-F$ bonds point away from the nitrogen atom. The dipole moment of the lone pair points towards the nitrogen atom. Since the lone pair dipole and the resultant bond dipole are in opposite directions,they partially cancel each other out,resulting in a smaller net dipole moment $(0.24 \ D)$.Therefore,both $(A)$ and $(R)$ are correct,and $(R)$ is the correct explanation of $(A)$.

Consider the following:
Assertion $(A)$: Dipole moment of $NF_3$ is lesser than $NH_3$.
Reason $(R)$: In $NF_3$,the orbital dipole due to lone pair of electrons is in the opposite direction to the resultant dipole moment of the three $N-F$ bonds.
The correct answer is:

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Consider the following:Assertion $(A)$: Dipole moment of $NF_3$ is lesser than $NH_3$.Reason $(R)$: In $NF_3$,the orbital dipole due to lone pair of electrons is in the opposite direction to the resultant dipole moment of the three $N-F$ bonds.The correct answer is: