Reaction 5:
CH3C≡CH
Reaction 6:
HC≡CH 
CH3C≡CH
Reaction 6:
HC≡CH
Reaction 1: CH3C≡CH 
Reaction 2: CH3C≡CH
Reaction 3: CH3C≡CH
Reaction 4: CH3C≡CH
Reaction 2: CH3C≡CH
Reaction 3: CH3C≡CH
Reaction 4: CH3C≡CH
Note that addition reactions 1, 2 and 5 (both asymmetric alkene and asymmetric reagent) give products according to those predicted by Markovnikov's rule.