NTA Abhyas NEET2020ChemistryChemical Bonding and Molecular StructurePractice
Which of the following statements is true about hydrogen bonding?
Options
- ACl and N have comparable electronegativities yet there is no H-bonding in HCl because size of Cl is large
- BIntermolecular H-bonding results in decrease in m.p. and b.p.
- CIce has maximum density at 0 ° C due to H-bonding
- DK H C l 2 ( H C l 2 - ) exists but K H F 2 ( H F 2 - ) does not exist due to lack of H-bonding in HCl
Correct answer
A. Cl and N have comparable electronegativities yet there is no H-bonding in HCl because size of Cl is large
Step-by-step solution
For hydrogen bonding, the size of the atom should be small and electronegativity must be high for e.g. F, O, N. Although chlorine has high electronegativity but due to its larger size hydrogen bonding is not possible with it. K H C l 2 ( H C l 2 - ) don't exists but K H F 2 ( H F 2 - ) exists due to lack of H-bonding in HCl but possible in HF.