Hydrogen bonding plays a central role in the following phenomena :

1.	Hydrogen bonding plays a central role in the following phenomena :
Answer» Ice floats in water HIGHER Lewis basicity of primary amines than tertiaryamines in aqueous solution Formic acid is more acidic than acetic acid Dimerisation of acetic acid in BENZENE Solution :(a) Density of ice is less than that of water due to cage-like structure on ACCOUNT of hydrogen bonding with other `H_(2)O` molecular . Hence ,ice floats on water (b) `R-NH_(2) +H-OHharr R-overset(+)underset((I))(NH_(3))+OH^(-)` `R_(3)N +H-OHharr R_(3)-overset(+)underset((II))(NH)+OH^(-)` Cation (I) is more stabilised through hydrogen bonding than cation (II). Hence ,`R-NH_(2)` is stronger base than `R_(3) N` in aqueous solution . (c) HCOOH is stronger acid than `CH_(3)COOH`due to inductive effect and not due to hydrogen bonding . (d) Acetic acid dimerises in benzene through intermolecular hydrogen bonding

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