Define the following with one example of each :
(i) Zwitter ion ,
(ii) Glycosidic linkage.

Explanation

(i) Zwitter ion : The -COOH and `-NH_(2)` groups of amino acids do not exists as such but they react with each other to form internal salt structure called Zwitter ion.
It is a neutral species but carries both positive and negative charges.
`H_(2)overset(. .)(N) - underset(R)underset(|)(Coverset(..)H)- overset(O)overset(||)(C) - underset(..)overset(..)(O): H to H_(3) overset(+)(N) - underset(R) underset(|)(CH) - overset (O)overset(||)(C) - overset(-)overset(..)underset(..)(O):`
e.g., Amino acids.
(ii) Glycosidc linkage : The linkage which is estabilsed between two carbohydrates which is estabished between two carbohydrates units involving reducing group as a result of removal of water molecule.
e.g., Sucrose `C_(1)` of `alpha` - glucose and `C_(2)` of `beta` - fructose