Identify the correct orders against the property mentioned Choose the correct answer from the options given below:
- A, C only
- B, C only
- A, D only
- B, D only
Answer
(3) A, D only
Solution
A. Dipole moment (NCERT): H2O (1.85 D) > NH3 (1.47 D) > CHCl3 (1.04 D) → correct.
B. Lone pairs on Xe: XeF2 = 3, XeF4 = 2, XeO3 = 1 ⇒ XeF2 > XeF4 > XeO3 → given order incorrect.
C. Bond length (NCERT): N–O (136 pm) > C–H (107 pm) > O–H (96 pm) ⇒ given order is reversed → incorrect.
D. Bond enthalpy ( kJ mol-1): N2 (946) > O2 (498) > H2 (435.8) → correct.
∴ A and D only.
Answer: (3)