WAEC - Chemistry (2000 - No. 31)
2 moles of hydrogen gas will react completely with one mole of....
CH2=CHCl
CH3-CH=CH2
C6H5-CH3
CH≡C-CH2-CH3
Explication
This is referred to the hydrogenation of alkynes.Hydrogenation of alkynes is a reaction that replaces one or more of an alkyne's pi bonds with hydrogen atoms. This process is a step-by-step reaction that typically converts a triple bond into a double bond, and then a double bond into a single bond.
This is applicable to option D because, you'll be needing 4 atoms of Hydrogen as shown in the question, to break the tripple bond, and convert first to double bond, and then to a single bond.