NEET

Practice Test 12

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Which of the following compounds can be detected by Molisch’s Test ?

Solution

Molisch's Test : This is a general test for carbohydrates.One or two drops of alcoholic solution of α-naphthol is added to 2 ml glucose solution. 1 ml of conc. H₂SO₄ solution is added carefully along the sides of the test-tube. The formation of a violet ring at the junction of two liquids confirms the presence of a carbohydrate or sugar.

The presence or absence of hydroxyl group on which carbon atom of sugar differentiates RNA and DNA?

Biuret test is not given by

Solution

Biuret test produces violet colour on addition of dilute CaSO₄ to alkaline solution of a compound containing peptide linkage.

The two functional groups present in a typical carbohydrate are:

Solution

Glucose is considered as a typical carbohydrate which contains –CHO and –OH group.

α- D-(+)-glucose and α-D-(+)-glucoseare

Solution

Since α - D - (+)-glucose and β– D – (+) glucose differ in configuration at C – 1 atom so they are anomers.Anomers are those diastereomers that differ in configuration at C – 1 atom.

Which of the following acids does not exhibit optical isomerism ?

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Biomolecules

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