Question.Starting with acetylene and any necessary alkyl halides,show how to prepare 2-hexyne. H一C≡C一H CH3一C≡C-CH2CH2CH3 Solution:Decide what carbons need to be added to each side,then convert the terminal alkyne to an acetylide ion and do the Sx2 reaction: H一C三C-H CH3CC-CH2CH2CH3 1.NaNH, 1.NaNH2 2.CH3I,DMF 2.CH3CH2CH2Br,DMF CH3-C=C-H College of Science Question. Starting with acetylene and any necessary alkyl halides, show how to prepare 2-hexyne. H C C H CH3 C C CH2CH2CH3 Solution: Decide what carbons need to be added to each side, then convert the terminal alkyne to an acetylide ion and do the SN2 reaction: H C C H CH3 C C CH2CH2CH3 1. NaNH2 2. CH3I, DMF CH3 C C H 1. NaNH2 2. CH3CH2CH2Br, DMF