Question

Identify the correct orders against the property mentioned:

A. H₂O > NH₃ > CHCl₃ - dipole moment

B. XeF₄ > XeO₃ > XeF₂ - number of lone pairs on central atom

C. O-H > C-H > N-O - bond length

D. N₂ > O₂ > H₂ - bond enthalpy

Choose the correct answer from the options given below:

Options

• A, D only

• B, D only

• A, C only

• B, C only

Answer 1

A, D only

Explanation:

Order A is correct because H₂O has the highest dipole moment due to its two lone pairs and highly electronegative oxygen. NH₃ follows with one lone pair, while CHCl₃ has the lowest value because its bond pulls partially cancel each other out.

Order D is correct because bond enthalpy depends on the number of bonds. N₂ has a triple bond (strongest), O₂ has a double bond, and H₂ has only a single bond (weakest). Therefore, N₂ requires the most energy to break.

Order B and C are wrong because XeF₂ actually has the most lone pairs (3), and Hydrogen bonds (C-H/O-H) are very short, not the longest.