Given below are two statements — Assertion (A) and Reason (R):

Assertion (A): and molecules have pyramidal shape with a lone pair on nitrogen. The resultant dipole moment of is greater than that o

Question

Given below are two statements — Assertion (A) and Reason (R):

Assertion (A):  and  molecules have pyramidal shape with a lone pair on nitrogen. The resultant dipole moment of  is greater than that of .

Reason (R): In , 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.

Choose the correct answer:

Canvas Classes · Accepted Answer

Step 1 — Evaluate Assertion (A):
- : μ ≈ 1.47 D; : μ ≈ 0.24 D
-  has greater dipole moment ✓ A is true

Step 2 — Evaluate Reason (R):
- In : N–H bond dipoles point toward N (N is more electronegative than H). The lone pair dipole also points away from N (in same direction as bond dipoles) → reinforce each other → large μ
- In : N–F bond dipoles point toward F (F is more electronegative than N). The lone pair dipole points away from N → opposes the bond dipoles → small μ
- R correctly explains wh

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