JEE Main Chemistry question

[OJEE 2009] A carbohydrate is treated with α-naphthol and conc. H₂SO₄. What colour will be formed at the junction of two liquids?

(A)Blood-red
(B)VioletCorrect
(C)Brown
(D)Orange

Answer: (B)

Solution

This is Molisch's test, a general test for all carbohydrates: concentrated sulphuric acid first dehydrates the sugar to furfural or a furfural derivative, which then condenses with α-naphthol to give a

See the full step-by-step solution

Create a free account to read the complete working, and practise questions like this in a timed test.

Create a free account

Question ID VK-150599