Question

Which contains hydrogen bonds?

• A. $HF$
• B. $HCl$
• C. $HBr$
• D. $HI$

Answer 1

The correct option is A $HF$

Ans : $A\to$ $HF$

Florine being smaller atom attracts the outer shell of electrons by the positive nucleus & makes if more electronegative because of high charge density. Thus it can attract a partially positively charged hydrogen from another $H-F$ molecule resulting in hydrogen bonding between $F$ & $H$.