Identify reactant which form given product

CH3 CH3-C-O-CH3 T CH3 CH3 I (1) CH-C-Br + CH,-8(2) I CH3 CH3 Te (3) CH C-O+CH-Br(4) CH CH3 e CH-C-O+CH0 I CH3 e CH I e CH,CO+CH,H I CH3