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For a double strand $DNA$, one strand is given below:
The amount of energy required to split the double strand $DNA$ into two single strands is . . . .kcal $mol ^{-1}$.
[Given: Average energy per $H$-bond for $A - T$ base pair $=1.0 kcal mol ^{-1}, G - C$ base pair $=1.5 kcal mol ^{-1}$, and $A - U$ base pair $=1.25 kcal mol ^{-1}$. Ignore electrostatic repulsion between the phosphate groups.]
When sugar ' $X$ ' is boiled with dilute $H _{2} SO _{4}$ in alcoholic solution, two isomers ' $A$ ' and ' $B$ ' are formed. $'A'$ on oxidation with $HNO _{3}$ yields saccharic acid where as ' $B$ ' is laevorotatory. The compound ' $X$ ' is ....... .