Biomolecules

DNA contains b-D-2- deoxyribose sugar while RNA contains b-D-ribose.

(a) Sucrose  → α-D glucose and β-D fructose

(b) Lactose  → β-D- galactose and β-D glucose

(c) maltose  → α-D glucose and α-D-glucose

Kindly consider the following figure

Reducing sugar must have hemi-acetal group and option (A) has that group.

Other name of animal starch is glycogen.

(A) Neoprene is Elastomer

(B) Nylon- (6, 6) is fibre

(C) PVC is thermoplastic

(D) Novolac is thermosetiting plastic.

$\underset{\begin{array}{l}Sodiumextract\\ ofsulphur\end{array}}{N{a}_{2}S}+N{a}_2\underset{Sodiumnitroprusside}{\left[Fe{\left(CN\right)}_{5}NO\right]}\to N{a}_4\underset{violet/purple}{\left[Fe{\left(CN\right)}_{5}NOS\right]}$

$\alpha -$ Helix (2°) structure of protein is stabilized by intermolecular H-bonding.

$C_{12}{H}_{22}{O}_{11}+H_{2}O\to \alpha -D-glucose+\alpha -D-glucose$

In maltose, two units of a-D-glucose are linked by glycosidic linkage at C₁ and C₄ as shown.

    

a - D – glucose                              a - D - glucose

Maltose has hemiacetal link so it is reducing sugar.