Concept:A triple bond exists when two atoms share three pairs of electrons, giving a total of six shared electrons between them.
Explanation:The covalent molecule that contains a triple bond is nitrogen gas,
N2.
In its Lewis structure, the two nitrogen atoms are joined by three shared electron pairs, which is written as
N≡N.
This arrangement satisfies the octet rule for each nitrogen atom.
Now consider the other options.
CH4 and
NH3 contain only single covalent bonds between their atoms.
O2 has a double bond because it shares only two pairs of electrons, represented as
O=O.
Since a triple bond is present only in
N2, it is the correct choice.
Answer:C.
N2