SELECT * FROM question_mgmt as q WHERE id=1353 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=2 AND subId=9 AND chapterId=45 and ex_no='1' AND status=1 ORDER BY CAST(question_no AS UNSIGNED) CBSE Free NCERT Solution of 11th chemistry Chemical Bonding and Molecular Structure define hydrogen bond is it weaker or stronger tha

Question:

Define hydrogen bond. Is it weaker or stronger than the van der Waals forces?

Answer:

A hydrogen bond represents a dipolar attraction between hydrogen atom and highly electronegative atom. The hydrogen bond is represented by ----------(dotted lines).

For example: H -----------X -----------X -------- X------

 

X = O, N, S, F, Cl….

The bond pair involved in hydrogen bonding was attracted more towards highly electronegative atom, as a result H atom will start acquiring a partial positive charge (δ+) and the electronegative atom will acquire a partial negative charge (δ-).

The magnitude of H-bonding is maximum in the solid state and minimum in the gaseous state.

Hydrogen bonds are of two types

(i) Intermolecular H-bond e.g., HF, H2O etc.

(ii) Intramolecular H-bond e.g., o-nitrophenol

Vander waal’s forces are weak forces and exist in non -polar compounds and noble gases .As compared to hydrogen bonds they are weak in nature because of strong dipole -dipole interaction in hydrogen bonding.


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