Which one of the following nitro compounds when react with nitrous acid followed by treatment with alkali produces blue colour?

Options

A. 2-methyl-2-nitropropane
B. 2-methyl-1-nitropropane
C. 2-nitropropane
D. Nitrobenzene

Answer

C

Explanation

Nitro group attached to secondary carbon atom will give pseudo nitrol with `HNO_(2)` which on further treatment with alkali gives blue colour
`underset(CH_(3))underset(|)overset(CH_(3))overset(|)(HC)-NO_(2)overset(HONO)rarrH_(3)C-underset(NO)underset(|)overset(CH_(3))overset(|)(C)-NO_(2)overset(NaOH)rarr` Blue Colour