Write a short note on chitin

(1) Chitin is the second most abundant organic compound in nature.
(2) It is a fibrous homopolysaccharide of high tehsile strength.
(3) Its basic unit is a nitrogen containing glucose derivative known as N-acetyl glucosamine.
(4) Chitin is soft and leathery, it provides both strength
and elastidty. It become hard when impregnated with calrium carbonate