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

(i) HF>H_{2}O>NH_{3}
(ii) H_{2}O>HF>NH_{3}
(iii)NH_{3}>HF>H_{2}O
(iv) NH_{3}>H_{2}O>HF

Answers (1)

The answer is the option (ii) H_{2}O>HF>NH_{3}

Explanation: The factors that affect the strength of hydrogen bond are electronegativity, size of atom and number of hydrogen bonds per mol. Usually, F is the most electronegative element, but, in H2O, there are more H-bonds, and their size is smaller than N.

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