The following reaction occurs in a voltaic cell: Cu2++Zn→Zn2++Cu .

Which of the following reactions occurs at the cathode?

Cu2++2e−→Cu

Zn→Zn2++2e−

Cu2++2e−→Zn2++Cu

Cu2++Zn→Zn2++2e−

Indicate whether the specified alkyl halides will form primarily substitution products, only elimination products, both substitution and elimination products, or no products when they react with sodium methoxide. 1-bromobutane 1-bromo-2-methylpropane 2-bromobutane 2-bromo-2-methylpropane