Question

In which cases do you expect deviations from the idealized bond angle? Check all that apply.

A. NF₃
B. CF₄
C. H₂S
D. H₂O

Answer 1

The correct answer is option A. Molecules with lone pairs of electrons experience deviations from the idealized bond angle. NF₃ and H₂O are examples of such molecules.

Step-by-step explanation:

According to the VSEPR model, deviations from the idealized bond angle are expected in molecules that have lone pairs of electrons. Lone pairs of electrons take up more space and repel the bonding electron pairs, causing the bond angles to deviate from the idealized values.

Applying this concept, we can expect deviations from the idealized bond angle in the following cases:

• NF₃: Nitrogen trifluoride has a trigonal pyramidal shape with a lone pair on the central nitrogen atom, causing the bond angle to be less than the ideal 109.5 degrees.
• H₂O: Water has a bent shape with two lone pairs on the central oxygen atom, leading to a bond angle less than the ideal 109.5 degrees.

Therefore, the correct answers are A. NF₃ and D. H₂O.