Arrange the following diatomic molecules in order of weakest to strongest bond: HF, HCl, HBr, and HI.

Answer 1

Remember this.
Bond strength is a function of electronegativity as one goes from the left to the right in the periodic table.
So CO2, NH3, HF is stronger from left to right.
Bond strength decreases as we go DOWN the table because of size. So HF is stronger than HCl > HBr etc.