NEET UG CHEMISTRY MCQ: BIOMOLECULES

1 Hard

1 of 1

Application +4 | -1

The optical rotation of

\alpha-\mathrm{D}

fructose is

-21^{\circ}

and that of its

\beta

-form is

-133^{\circ}

. The equilibrium mixture of these anomers has an optical rotation of

-92^{\circ}

. What is the

\%

\alpha

-form (upto one decimal place) in its equilibrium mixture?

View answer and explanation

Correct option: A

36.6

Option A (36.6) is correct because the percentage of the alpha form can be calculated using the weighted average of the specific rotations of the alpha and beta forms.

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A carbohydrate is treated with α-naphthol and conc.

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. What colour will be formed at the junction of two liquids? Drying oils are so called because they: If specific rotation of glucose solution is

52^\circ

and that of fructose solution is

-92^\circ

then what will be the specific rotation of invert sugar? The compound, which give a positive ninhydrin test and a negative Benedict’s solution test, is A good example of an unsaturated acid got by the hydrolysis of an oil is: Glycerine used as a preservative for fruits, vegetables due to