Question

Which of the following is a highly polar molecule?

• A. $HCl$
• B. $HF$
• C. $H_{2}S$
• D. $N{H}_3$

Answer 1

Answer: (B)

$HF$

The order of electronegativities is as follows:

$F>O>N>Cl>Br>I>S>C>H$

Now, clearly the difference in electronegativities is maximum between fluorine and hydrogen. Therefore, $HF$ will show maximum polar character.

So, $B$ is the correct answer.