Given below are two statements: one is labelled as Assertion ( A ) and the other is labelled as Reason (R). Assertion (A): NH_3 and NF_3 molecule…

Given below are two statements : one is labelled as Assertion $\displaystyle (\mathrm{A})$ and the other is labelled as Reason (R). Assertion (A) : $\displaystyle \mathrm{NH}_3$ and $\displaystyle \mathrm{NF}_3$ molecule have pyramidal shape with a lone pair of electrons on nitrogen atom. The resultant dipole moment of $\displaystyle \mathrm{NH}_3$ is greater than that of $\displaystyle \mathrm{NF}_3$. Reason (R) : In $\displaystyle \mathrm{NH}_3$, the orbital dipole due to lone pair is in the same direction as the resultant dipole moment of the N-H bonds. F is the most electronegative element. In the light of the above statements, choose the correct answer from the options given below :