State the valency of each carbon atom in $(i)$ an alkane and $(ii)$ an alkyne.
(4) $(i)$ In an alkane,each carbon atom is bonded to four other atoms through single covalent bonds,so its valency is $4$.
$(ii)$ In an alkyne,each carbon atom involved in the triple bond is bonded to two other atoms,maintaining a total valency of $4$.
$(ii)$ In an alkyne,each carbon atom involved in the triple bond is bonded to two other atoms,maintaining a total valency of $4$.
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