Starting with acetylene, show the reagents you would use to prepare the following compound: 2,7-dimethyl-4-octyne 1) NaNH2 2) Br 1) NaNH2 2) Br 3) NaNH2 4) Br 1) NaNH2 2) Br 3) NaNH2 4) EtBr 1) NaNH2 2) EtBr 3) NaNH2 4) Br