Question

Pure covalent bonds are different from polar covalent bonds in that

Select one:

a. Electrons are distributed unevenly across pure covalent species and evenly across polar covalent species.

b. Electrons are distributed evenly across pure covalent species and unevenly across polar covalent species.

c. Electrons are lost when pure covalent bonds form, but they are gained during the formation of polar covalent bonds.

d. Electrons are lost to a nearby atom not participating in pure covalent bonds and are not lost when polar covalent bonds are formed.

Answer 1

Pure covalent species: In case of identical atoms,the electrons in the bond are shared equally due to same electronegativity.This happens in diatomic molecules like Cl₂ and H₂

Polar covalent species: In case of different atoms,due to electronegativity,bonding electrons are shared unequally.Thus they lead to formation of partial charges.Example: HCl

So the correct option should be (b) Electrons are distributed evenly across pure covalent species and unevenly across polar covalent species.