MCQ
Given below are two statements: one is labelled as Assertion $(A)$ and the other is labelled as Reason $(R)$.
Assertion $(A)$ : $\mathrm{NH}_3$ and $\mathrm{NF}_3$ molecule have pyramidal shape with a lone pair of electrons on nitrogen atom. The resultant dipole moment of $\mathrm{NH}_3$ is greater than that of $\mathrm{NF}_3$.
Reason $(R)$ : In $\mathrm{NH}_3$, the orbital dipole due to lone pair is in the same direction as the resultant dipole moment of the $\mathrm{N}-\mathrm{H}$ bonds. $\mathrm{F}$ is the most electronegative element.
In the light of the above statements, choose the correct answer from the options given below:
- ✓Both $(A)$ and $(R)$ are true and $(R)$ is the correct explanation of $(A)$
- B$(A)$ is false but $(R)$ is true
- C$(A)$ is true but $(R)$ is false
- DBoth $(A)$ and $(R)$ are true but $(R)$ is NOT the correct explanation of $(A)$
is :