Q. Co-ordinate bond is absent in:

2010 201 Rajasthan PMTRajasthan PMT 2002 Report Error

A

$B H_{4}^{⊖}$

B

$C O_{3}^{- 2}$

C

$H_{3} O^{+}$

D

$N H_{4}^{\oplus}$

Solution:

$C O_{3}^{- 2}$ ion $⎣ ⎡ O^{-} C ∣ O_{-} = O ⎦ ⎤$
does not contain any co-ordinate bond.