Question

A substance that can donate a pair of electrons to form a covalent bond is known as a(n) _____ base.

Answer 1

A substance that can donate a pair of electrons to form a covalent bond is known as a Lewis base. It is any substance that can donate a pair of nonbonding electrons. The Lewis theory suggests that acids react with bases to share a pair of electrons with no change of oxidation numbers of any atoms.

Answer 2

Answer : A substance that can donate a pair of electrons to form a covalent bond is known as a(n) Lewis-base.

Explanation :

According to the Lewis acid-base theory,

Lewis acid : It is a substance that can accepts pairs of electrons to form a covalent bond.

Lewis-base : It is a substance that can donates pairs of electrons to form a covalent bond.

For example :

`H^++OH^-\rightarrow H_2O`

In this reaction,
`H^+` ion is Lewis-acid and
`OH^-` ion is a Lewis-base. The
`OH^-` ion donates electrons to
`H^+` ion to form
`H_2O`.

Hence, a substance that can donate a pair of electrons to form a covalent bond is known as a(n) Lewis-base.