question_answer

Phenol, in Liebermann's nitroso test, give the colour:

A)  red                                       

B)  yellow

C)   blue                                    

D)  pink

Correct Answer: C

Solution :

                 Phenol gives Liebermann's nitroso test to give deep blue colour due to the formation of sodium salt of indophenol. \[Phenol\xrightarrow[conc.{{H}_{2}}S{{O}_{4}}]{NaN{{O}_{2}}}Blue\xrightarrow{HOH}\operatorname{Re}d\]