A) red litmus
B) rosaniline hydrochloride
C) methyl orange
D) 2, 4 dinitrophenyl hydrazine
Correct Answer: B
Solution :
Schiffs reagent is an aqueous solution of magenta or pink coloured rosaniline hydrochloride which has been decolourised by passing \[S{{O}_{2}}.\]When aldehydes are treated with decolourised solution of Schiffs reagent, its pink or magenta colour is restored. This is used to detect the presence of aldehyde as ketones do not give this test.
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