Identify the correct orders against the property mentioned:

A. \mathrm{H2O NH3 CHCl3} — dipole moment

B. \mathrm{XeF4 XeO3 XeF2} — number of lone pairs on the central atom

C. O–H C–H N–

Question

Identify the correct orders against the property mentioned:

A. \mathrm{H2O > NH3 > CHCl3} — dipole moment

B. \mathrm{XeF4 > XeO3 > XeF2} — number of lone pairs on the central atom

C. O–H > C–H > N–O — bond length

D. \mathrm{N2 > O2 > H2} — bond enthalpy

Choose the correct answer from the options given below:

Vishal Gupta · Accepted Answer

A. Dipole moments: \mathrm{H2O} (1.85 D) > \mathrm{NH3} (1.47 D) > \mathrm{CHCl3} (1.04 D) — A correct. Bond enthalpy: N≡N (945) > O=O (498) > H–H (436 kJ/mol) — D correct. \mathrm{XeF2} has three lone pairs on Xe, more than \mathrm{XeF4}'s two — B wrong. Bond lengths run N–O (~140 pm) > C–H (109 pm) > O–H (96 pm), the reverse of C — C wrong. Hence A and D.

Chemical Bonding and Molecular Structure

More from this chapter in past papers