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(underset(CH_(3))(|))overset(overset(CH_(3))(|))(HC)- NO_(2) overset(HONO)rarr H_(3)C- underset(underset(NO)(|))overset(overset(CH_(3))(|))(C)- NO_(2) overset(NaOH)rarr` Blue colour