Question

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.

Assertion A: Dipole-dipole interactions are the only non-covalent interactions, resulting in hydrogen bond formation.

Reason R: Fluorine is the most electronegative element and hydrogen bonds in $HF$ are symmetrical.

In the light of the above statements, choose the most appropriate answer from the options given below:

• A. A is false but R is true
• B. Both A and R are true and R is the correct explanation of A
• C. A is true but R is false
• D. Both A and R are true and R is not the correct explanation of A

Answer 1

The correct option is A A is false but R is true

Dipole-dipole interaction is not only interaction responsible for hydrogen bond formation. Ion-dipole interaction can also be responsible for hydrogen bond formation. Hence, assertion A is false.

F is most electronegative element and $HF$ has symmetrical hydrogen bonding. Hence, reason R is true.