Subjective Type

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

Solution

A hydrogen bond is the electrostatic attraction between polar groups that occurs when a hydrogen (H) atom bound to a highly electronegative atom such as nitrogen (N), oxygen (O) or fluorine (F) experiences attraction to some other nearby highly electronegative atom. These hydrogen-bond attractions can occur between molecules (intermolecular) or within different parts of a single molecule (intramolecular). The hydrogen bond (5 to 30 kJ/mole) is stronger than a van der Waals interaction, but weaker than covalent or ionic bonds. This type of bond can occur in inorganic molecules such as water and in organic molecules like DNA and proteins.

SIMILAR QUESTIONS

Chemical Bonding

Strongest hydrogen bond is present in:

Chemical Bonding

In solid ammonia, each $${NH}_{3}$$ molecule has six other $${NH}_{3}$$ molecules as nearest neighbours. $$\Delta H$$ of sublimation of $${NH}_{3}$$ at the melting point is $$30.8kJ$$ $${ mol }^{ -1 }$$ and the estimated $$\Delta H$$ of sublimation in the absence of hydrogen bonding is $$14.4kJ$$ $${ mol }^{ -1 }$$. What is the strength of hydrogen bond in solid ammonia in $$kJ$$ $${ mol }^{ -1 }$$? Give your answer in nearest integer number.

Chemical Bonding

$$Ka_{2}$$ of Maleic acid is lesser than $$Ka_{2}$$ of fumaric acid due to:

Chemical Bonding

Arrange the following as stated. Increasing strength of hydrogen bonding (X-H-X). $$O,S,F,Cl,N$$

Chemical Bonding

Which of the following hydrogen bonds are strongest in vapour phase?

Chemical Bonding

Which of the following has strongest bond?

Chemical Bonding

Hydrogen bonds are formed in many compounds e.g., $$H_2O, HF \ and \ NH_3$$. The boiling point of such compounds depends to a large extent on the strength of the hydrogen bond and the number of hydrogen bonds. The correct decreasing order of the boiling points of the above compounds is :

Chemical Bonding

Among NH3,H2O,HF and H2S which have the highest magnitude of hydrogen bonding?

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