Which of the formulas of compounds from hydrogen bond with water?
1. $C H_{4}$ 2. $H F$
3. $N H_{3}$ 4. $O_{2}$
5. $C_{6} H_{6}$

2, 3

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3, 4

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1, 4, 5

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3, 1, 5

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2, 4, 5

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Solution

The correct option is E $2, 3$
Hydrogen bond has partially electrostatic attraction between a hydrogen atom which is bound to a more electronegative atom or groups such as nitrogen, oxygen or fluorine. They can be intermolecular or intramolecular. Thus, hydrogen bond forming molecules are $H F, N H_{3}$

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Question 04

Hydrogen bonds are formed in many compounds e.g., $H_{2} O, H F, N H_{3}$ . The boiling point of such compounds depends to a extent on the strength of hydrogen bond and the number of hydrogen bonds. The correct decreasing order of the boiling points above compounds is