Question

The atoms or ions with available low-energy orbitals can attract loosely bonded pair of electrons from other molecules. A higher amount of positive charge on the side atom or ion makes its orbitals even more attractive for the loosely bonded electron pairs. The molecules with loosely bonded pairs also have different polarizabilities. The higher size of surrounding molecules and lower size of atom offering low energy orbitals increases crowding and diminishes the tendency of bonding.

Which is strongest donor ?

• A. $C{l}^{-}$
• B. ${}^{-}OH$
• C. $N{H}_3$
• D. ${}^{-}CN$

Answer 1

The correct option is D ${}^{-}CN$

$C{N}^{-}>N{O}_2^{-}>en>py\sim N{H}_3>SC{N}^{-}>H_{2}O>O{H}^{-}>F^{+}>C{l}^{-}>B{r}^{-}>l^{-}$

$\left(small\Delta \right)$ weak field