Question

Choose the bond below that is most polar. choose the bond below that is most polar. h-cl h-br h-i c-h h-f

Answer 1

Answer:   [D]:  "  H — F " .
_____________________________________________

Answer 2

Answer:

H-F

Explanation:

Hello,

To state which is the most polar bond we must perform the subtraction between the hydrogen's electronegativity and the other atoms' electronegativities, nevertheless, since the fluorine is the most electronegative element, such difference is the greatest one, therefore, the H-F has the most polar bond (in fact, it reaches the ionic bond). Lets substantiate it via the calculations:

$\Delta E_{HF}=3.98-2.2=1.78\\\Delta E_{HCl}=3.16-2.2=0.96\\\Delta E_{HBr}=2.96-2.2=0.76\\\Delta E_{HI}=2.66-2.2=0.46\\\Delta E_{CH}=2.55-2.2=0.35$

Best regards.