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:
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) is true but is false
- (B) is false but is true✓ Correct
- (C)Both and are true and is the correct explanation of
- (D)Both and are true but is NOT the correct explanation of
Answer: (B)
Solution
Assertion A is FALSE: Hydrogen bonding is not solely due to dipole-dipole interactions. It is a special type of interaction involving H bonded to highly electronegative atoms (F, O, N) and requires both dipole-dipole interaction and orbital overlap considerations.
Reason R is TRUE: Fluorine is indeed the most electronegative element, and hydrogen bonds in HF are symmetrical (linear arrangement).
Since A is false and R is true, the correct answer is (B).
Reason R is TRUE: Fluorine is indeed the most electronegative element, and hydrogen bonds in HF are symmetrical (linear arrangement).
Since A is false and R is true, the correct answer is (B).
JEE Main · 2021 · 26 Feb 2021 · Shift 1 · Single correct option