Which of the following does not have triple bond between the atoms?

Options

A. `N_(2)`
B. CO
C. NO
D. `C_(2)^(2-)`

Answer

C

Explanation

Nitric oxide (NO) has 15 electrons and its bond order is 2.5. It does not contain triple bond between the atoms.
`N_(2)RightarrowN-=NCORightarrowoverset(-)(C)-=overset(+)(O):`
`NORightarrow:N=O:C_(2)^(2^-)Rightarrow[C-=C]^(2^-)`