Question

Which of the following species contain coordinate bond:
a) $AlC{l}_3$
b) $CO$
c) $\left[Fe\right(CN{)}_6{]}^{4-}$
d) $N_3^{-}$

• A. a, b, c
• B. b, c, d
• C. a, c, d
• D. None of these

Answer 1

The correct option is B b, c, d

Co-ordinate bond is a type of an alternate covalent bond that is formed by sharing of electron pair from a single atom. Both shared electrons are donated by the same atom. It is also called dative bond or dipolar bond.
$N\equiv N\to N^{-}$
Co-ordinate covalent bonds are present between $Fe$ and $C$ and also in between $C$ and $N$.