9. Which of these reactions will proceed spontaneously? a. Ni 2+ + H₂→ 2H+ + Ni b. Mg2+ + Pb+ SO2 PbSO4 + Mg -> c. AuCl + Cr Au+4Cl + Cr3+ d. Clo₂ + Cr3+ → Clo₂+ Cr²+

1.What are the major products obtained from the following reactions? Indicate the geometry (cis/trans). a) HBr, CH,COOH H3CH2C-CEC-CH2CH3 ? b) H- -C4 H9 ? CH,Cl2 2 2. For each reaction, give the expected substitution product and predict whether the mechanism will be first order (Sy1) or second order (Sy2): a) 2-chloro-2-methylbutane + CH;COOH b) isobutyl bromide + NAQME, c) 1-iodo-1-methylcyclohexane + CH,CH;OH

3. Consider the reaction: H3C-(CH₂) H H C—C—C—SCOA HH H₂C-(CH₂) a. What kind of reaction is being performed here? b. What enzyme performs this reaction? -C—C—C—SCOA H H c. What cofactors, if any, are required for this reaction?

5. Consider the reaction: | OH H H₂C-(CH₂) C C—C—SCOA HH H₂C-(CH₂) a. What kind of reaction is being performed here? b. What enzyme performs this reaction? OHO C—C—C—SCOA c. What cofactors, if any, are required for this reaction? H