Exams › JEE Advanced › Chemistry

Two statements are given below, one labelled Assertion (A) and the other Reason (R). Assertion A: Dipole-dipole interactions are the only non-covalent interactions responsible for hydrogen bond formation. Reason R: Fluorine is the most electronegative element and the hydrogen bonds in HF are symmetrical. Choose the most appropriate option.

1. A is false but R is true
2. Both A and R are true and R is the correct explanation of A
3. A is true R is false
4. Both A and R are true but R is NOT the correct explanation of A

Correct answer: A is true R is false

Solution

Hydrogen bonding is essentially an electrostatic dipole-dipole type interaction, so A is taken as true; however the hydrogen bonds in HF are not symmetrical, so R is false.

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