Question

The alcohol that gives a blue coloured solution after treating it with Red $P$ and $I_2$ followed by a reaction with $AgN{O}_2$ and then, to the product formed, adding $HN{O}_2$ and by treating the product with an alkali is:

• A. 1–hydroxybutane
• B. 2–hydroxybutane
• C. 2–hydroxy–2–methylpropane
• D. 1-hydroxy-2-methylpropane

Answer 1

The correct option is B 2–hydroxybutane

The given sequential process represents the Victor Mayer's test. It is a test to distinguish alcohols. Primary alcohols gives red colour, secondary alcohol gives blue colour and tertiary does not produce any colour.
In the given options, 2-hydroxybutane is a secondary alcohol and is the correct answer.