1. A Review of General Chemistry

Draw Lewis structures for the following free radicals.

a. The ethyl radical, CH₃—ĊH₂

b. The tert-butyl radical, (CH₃)₃C•

Draw Lewis structures for the following compounds and ions, showing appropriate ­formal charges.

(e) ⁺CH₃

(f) ^–CH₃

(g) NaBH₄

(h) NaBH₃CN

Cyclopropane (C₃H₆, a three-membered ring) is more reactive than most other cycloalkanes.

a. Draw a Lewis structure for cyclopropane.

b. Compare the bond angles of the carbon atoms in cyclopropane with those in an acyclic (noncyclic) alkane.

In addition to radicals, anions, and cations, a fourth class of reactive intermediates is carbenes. A neutral species, the simplest carbene has a molecular formula of CH₂.

(a) Draw the Lewis structure of CH₂.

Draw the Lewis structure for the following molecular formulas.

(l) SO₄^2-

Which of the following best describes the Lewis structure of the $C_3{N}_2+$ (diazomethanium) ion?

Which of the following best represents the correct Lewis structure for $C_2{H}_{5}N$ (ethylamine, written as CH$3_{}$CH$2_{}$NH$2_{}$)?

After drawing the Lewis structure of $CHF3$, what is the ideal bond angle around the central carbon atom?

Draw Lewis structures for

a. two compounds of formula C₄H₁₀

b. two compounds of formula C₂H₆O

Which of the following best represents the most stable Lewis structure of acrolein ($C_3{H}_{4}O$)?

Which of the following is the best Lewis structure for ${\mathrm{CH}}_2{\mathrm{Cl}}_2$ (dichloromethane)?

Which of the following statements correctly describes the Lewis structure of ${\mathrm{Br}}_1{F}_5$ (bromine pentafluoride)?

Which of the following best describes the correct Lewis structure for $C_3{H}_4$ (also written as ${\mathrm{CH}}_2$$C$${\mathrm{CH}}_2$)?

How many valence electrons does each of the following contribute to a Lewis structure?

(i) Cl

Draw two Lewis structures for C₂H₆O.