2,5-dimethyl-3-hexyne reacts with 1 equivalent of bromine and 1 equivalent of chlorine to form 3,4-dibromo-3,4-dichloro-2,5-dimethylhexane.
In this reaction, 1 molecule of bromine is added to the triple bond. The triple bond is converted to a double bond.
Also, 1 equivalent of chlorine is added across a double bond. Double bond is reduced to a single bond.