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Question

Which of the following bonds are weakest in nature?

This question was previously asked in
SSC CGL 2017 (Tier 1) Previous Year Paper (16-Aug-2017) (Shift 1)
The correct answer is

Hydrogen bond

Bond strength is measured by the energy needed to break the bond. Covalent single, double and triple bonds are intramolecular and very strong — typical C–C, C=C and C≡C bond energies are roughly \(347,\ 614\ \text{and}\ 839\ \text{kJ/mol}\) respectively.

A hydrogen bond is an intermolecular attraction between an H bonded to a highly electronegative atom (N, O, F) and another electronegative atom. Its energy is only about \(10\text{–}40\ \text{kJ/mol}\) — an order of magnitude weaker than any covalent bond listed. Hence the hydrogen bond is the weakest.

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