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Chemical Bonding and Molecular Structure

Short Answer Type

241.

Give the reason for the following: Bond order in N₂ is 3 whereas it is 2.5 in NO ?

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Long Answer Type

242.

Give the points of resemblance and points of difference between valence bond theory and molecular orbtial theory.

120 Views

243.

What is hydrogen bond? How is it formed?

137 Views

Short Answer Type

244.

What are the conditions for hydrogen bonding ?

126 Views

245.

Water is a liquid while hydrogen sulphide is a gas. Explain.

119 Views

246.

Out of NH₃ and PH₃, which has higher boiling point and why?

127 Views

247.

Nitrogen and chlorine have the same electronegativity but only former shows intermolecular hydrogen bonding. Discuss.

113 Views

Long Answer Type

248.
What are the types of hydrogen bonding? Give examples.

Two types of hydrogen bonding exist.
i) Intermolecular hydrogen bonding.
ii) Intramolecular hydrogen bonding.

(i) Intermolecular hydrogen bonding: It is defined as hydrogen bonding which occurs between different molecules of the same or different substances. As a result, the molecules join together to form a long chain. For example, hydrogen fluoride molecules join through intermolecular hydrogen bonding to form long zig-zag chains.of associated molecules.

(ii) Intramolecular hydrogen bonding: It is defined as hydrogen bonding which occurs between atoms contained in the same molecule. An intramolecular hydrogen bond results in the cyclisation of the molecules and prevents their association.
Few examples involving intramolecular hydrogen bonding are given below: