The reaction sequence is as follows NaNH2 replace terminal H with Na in acetylene. CH3I replace both Na with CH3 . In presence of acid HgSO4 , water molecule will be added to acetylene and on rearrangement it converts into ketone.The reaction of a methyl ketone with bromine in the presence of hydroxide ions to give a carboxylate ion and a haloform is the haloform reaction.
