Q18.137P - Chemistry: Molecular Nature Of Matter And Change

Question

Which are Lewis acids and which are Lewis bases? 

$$\begin{gathered} \left(a\right)\mathbf{ }\mathit{C}{\mathit{u}}^{\mathbf{2}\mathbf{+}} \\ \left(b\right)\mathbf{ }\mathit{C}{\mathit{l}}^{\mathbf{-}} \\ \left(c\right)\mathbf{ }\mathit{S}\mathit{n}\mathit{C}{\mathit{l}}_{\mathbf{2}} \\ \left(d\right)\mathbf{ }\mathit{O}{\mathit{F}}_{\mathbf{2}} \end{gathered}$$

Step-by-Step Solution

Answer

Answer

(a) Lewis acid 

(b) Lewis base 

(c) Lewis acid

(d) Lewis base

Step 1: Concept introduction

A Lewis acid is a chemical species with an empty orbital that can accept an electron pair from a Lewis base and create a Lewis adduct.

Step 2: Finding Lewis acids and which are Lewis bases

(a)

$\mathit{C}{\mathit{u}}^{\mathbf{2}\mathbf{+}}$: Copper ion has a positive charge. It has an electron deficiency but can take electrons.

As a result, it's a Lewis acid.

Step 3: Finding Lewis acids and which are Lewis bases

(b)

$\mathit{C}{\mathit{l}}^{\mathbf{-}}$: The chloride ion has a negative charge. It has a high electron density and can donate electrons.

 As a result, it's a Lewis base.

Step 5: Finding Lewis acids and which are Lewis bases

c)

$\mathit{S}\mathit{n}\mathit{C}{\mathit{l}}_{\mathbf{2}}$: Because the octet of tin in $\mathit{S}\mathit{n}\mathit{C}{\mathit{l}}_{\mathbf{2}}$is incomplete, it is electron-deficient. The two electronegative chlorine atoms connected to it also drive electron density away from the center atom, causing it to become more positive or electron-deficient.

 As a result, $\mathit{S}\mathit{n}\mathit{C}{\mathit{l}}_{\mathbf{2}}$ is classified as a Lewis acid.

Step 6: Finding Lewis acids and which are Lewis bases

(d)

$\mathit{O}{\mathit{F}}_{\mathbf{2}}$: The central atom in $\mathit{O}{\mathit{F}}_{\mathbf{2}}$is oxygen, which possesses two lone pairs. The oxygen in the middle has a lot of electrons.

As a result, it's a Lewis base.