Based on electronegativity differences, which bond is a polar covalent bond?

A bond in which the electronegativity difference between the atoms is between 0.4 and 1.7 is called a polar covalent bond.

A polar covalent bond is a covalent bond in which the atoms have an unequal attraction for electrons and so the sharing is unequal.

i just learnt this recently but i need to look through my notes again

because natural gas is colorless, odorless, and tasteless, distributors add mercaptan (a chemical that smells like sulfur) to give natural gas a distinct unpleasant odor (it smells like rotten eggs). they locate the types of rock that are likely to contain natural gas deposits.