1. A Review of General Chemistry

For each of the following compounds and ions,

1. Draw a Lewis structure.

2. Show the kinds of orbitals that overlap to form each bond.

3. Give approximate bond angles around each atom except hydrogen.

a. [NH₂]^–

What is the molecular geometry predicted around the indicated carbon atom that is part of the double bond in $\mathrm{cyclohexene}$?

Predict the hybridization, geometry, and bond angles for the central atoms in

a. but-2-ene, CH₃CH=CHCH₃

Predict the hybridization and geometry of the carbon and nitrogen atoms in the following molecules and ions. (Hint: Resonance.)

a.

b.

c.

What is the molecular geometry around the carbon atom in phosgene ($CO{\mathrm{Cl}}_2$)?

Given a molecule of ${\mathrm{CH}}_4$, the geometry about atom $C_1$ is:

Describe the orbitals used in bonding and the bond angles in the following compounds:

d. N₂

Predict the approximate bond angles for

c. the H—C—N bond angle in (CH₃)₂NH.

d. the H—C—O bond angle in CH₃OCH₃

What is the molecular geometry of ${\mathrm{Cl}}_1{F}_5$ (chlorine pentafluoride)?

Predict the approximate bond angles:

c. the C—N—H bond angle in (CH₃)₂NH

d. the C—N—C bond angle in (CH₃)₂NH

Do the sp² carbons and the indicated sp³ carbons lie in the same plane?

What is the molecular geometry around the left-most carbon atom in the molecule $C_2{H}_4$ (written as CH$2_{\mathrm{}}$CHCH$3_{\mathrm{}}$)?

Predict the approximate bond angles in

a. the methyl cation.

b. the methyl radical.

c. the methyl anion.

What is the molecular geometry around each carbon atom in $C_2{H}_6$ (ethane)?