Which of the following species has a linear shape?

• A

  $\mathrm{O}_3$
• B

  $\mathrm{NO}_2^{-}$
• C

  $\mathrm{SO}_{2}$
• Correct answer
  D

  $\mathrm{NO}_2^{+}$

Solution

$\mathrm{NO}_2^{+}$has linear shape because of $s p$-hybridisation of $\mathrm{N}_{\text {in }} \mathrm{NO}_2$

Hence, the correct answer is option: 'D'.