Question

Which of the following statements about Lewis acids and bases is false?

Select one:

-Lewis acids are also known as electrophiles.

-A vacant orbital of a Lewis acid will interact with a filled orbital of a Lewis base to form a sigma bond.

-All Brønsted bases are also Lewis bases.

-Typically the LUMO of the Lewis base interacts with the HOMO of the Lewis acid.

-The reaction of hydride anion with a methyl cation would be an example of a Lewis base/Lewis acid reaction.

Answer 1

In the Lewis theory of acid-base reactions, bases donate pairs of electrons and acids accept pairs of electrons.

A Lewis acid is therefore any substance, such as the H+ ion, that can accept a pair of nonbonding electrons. In other words, a Lewis acid is an electron-pair acceptor.

Lewis Bases donate an electron pair. Lewis Bases are Nucleophilic meaning that they “attack” a positive charge with their lone pair. They utilize the highest occupied molecular orbital or HOMO (Figure 2). An atom, ion, or molecule with a lone-pair of electrons can thus be a Lewis base

An electrophile is a molecule that forms a bond to its reaction partner (the nucleophile) by accepting both bonding electrons from that reaction partner. Electrophilic reagents are Lewis acids

so false statement is

A vacant orbital of a Lewis acid will interact with a filled orbital of a Lewis base to form a sigma bond.