Addition of Halogen Acids ($$\text{HX}$$)

$$\text{R--C}\equiv\text{CH} \xrightarrow{\text{HX}} \text{R--CX=CH}_2 \xrightarrow{\text{HX}} \text{R--CX}_2\text{--CH}_3 \quad (\text{Geminal Dihalide})$$

(Notation: Both addition steps strictly follow Markovnikov's Rule, directing both halogen atoms to the same internal carbon)