1. A Review of General Chemistry

Which of the following statements best describes the relationship between resonance structures of a $\mathrm{carbocation}$?

Benzyl bromide is a primary halide. It undergoes S_N1 substitution about as fast as most tertiary halides. Use resonance structures to explain this enhanced reactivity.

For each of these ions, draw the important resonance forms and predict which resonance form is likely to be the major contributor.

(c)

Which of the following statements about the resonance structures of the carbonate ion ${\mathrm{CO}}_3{-}^2$ is correct?

Which of the following is the most stable resonance structure for the ${\mathrm{NCO}}_{}-$ ion when carbon is the central atom?

Which of the following best describes the resonance structures of the ozone molecule $O_3$?

Given the following arrow-pushing scheme for the ${CH{3}_{}COO}^{-}$ (acetate ion), choose the correct resonance structure that results: The lone pair on one oxygen atom forms a double bond with the central carbon, while the double bond between carbon and the other oxygen becomes a lone pair on that oxygen.

Which of the following statements best describes the resonance structures of $C_{\mathrm{Cl}}4$ (carbon tetrachloride)?

Which statement best describes the use of curved arrow notation when drawing resonance structures in organic molecules?

For each pair of ions, determine which ion is more stable. Use resonance forms to explain your answers.

(e)

(f)

In the following sets of resonance forms, label the major and minor contributors and state which structures would be of equal energy. Add any missing important resonance forms.

(d)

(e)