A) glycerine
B) water
C) hydrogen sulphide
D) hydrogen fluoride
Correct Answer: C
Solution :
To explain the physical property of many compound the concept of H-bond was introduced. It has been found that the compound in which H-atom is covalently bonded to \[F,\] \[O,\] \[N\] atom forms hydrogen bonds. The elements \[F,\] \[O,\] \[N\] have high electronegativity and small atomic radius. At room temperature water \[({{H}_{2}}O)\]is liquid while \[{{H}_{2}}S\] is gas. It is because H;0 molecules are associated through H-bond, H-bond is not formed among \[{{H}_{2}}O\] molecules because of the low electronegativity and large size of S, atom. \[H-\overset{H}{\mathop{\overset{|}{\mathop{O}}\,}}\,.....H-\overset{H}{\mathop{\overset{|}{\mathop{O}}\,}}\,.....H-\overset{H}{\mathop{\overset{|}{\mathop{O}}\,}}\,......\] Intra molecular bond \[({{H}_{2}}O)\]
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