12. Molecular Shapes & Valence Bond Theory

Determine whether each of the following statements about CH3+, CH3−, and CH4 is true or false:

a. All three have the same hybridization at the C atom.

b. All three have an unhybridized orbital on the C atom.

c. The H—C—H angles in CH3+ are larger than those in the other two.

d. CH3− and CH4 have the same electron-domain geometry.

Determine whether each of the following statements about the VSEPR model is true:

i. The model is based on the arrangement of electron domains that minimizes the overall repulsion among them.

ii. A double bond is considered to be two electron domains.

iii. A nonbonding electron domain is more spread out in space than a bonding domain.

According to valence-bond theory, which of the following correctly describes the formation of the Br—Br bond in the Br2 molecule?

i. The 4s orbital on one atom overlaps with the 4s orbital on the other atom.

ii. The 4s orbital on one atom overlaps with a 4p orbital on the other atom.

iii. A 4p orbital on one atom overlaps with a 4p orbital on the other atom.

iv. A 4p orbital on one atom overlaps with a lone pair on the other atom.