a) Monosaccharide – Glucose, Fructose,
Ribose Oligosaccharide – Sucrose, Maltose, Lactose (anyone)
b) i) From Sucrose (cane sugar): Sucrose on hydrolysis gives glucose and fructose.
or
Hydrolysis of starch by boiling it with dilute H2SO4 at 393 K under pressure.
ii) Due to peptide linkage an amide farmed between -COOH group and -NH group of amino acids of proteins.