When phenol is treated with excess bromine water, it gives:
(1) m-bromophenol
(2) o- and p-bromophenol
(3) 2,4-dibromophenol
(4) 2,4,6-tribromophenol
In the reaction, Phenol (A) (B) (C)
The compounds (A),(B) and (C) are of the following:
(1) benzene, nitrobenzene and aniline
(2) benzene, dinitrobenzene and m-nitroaniline
(3) toluene, m-nitrobenzene and m-toluidine
(4) benzene, nitrobenzene and hydrazobenzene
Phenol on oxidation gives chloranil. The oxidant used is:
1. K2S2O8
2. KMnO4
3. KCIO3 + HCl
4. none of these
A characteristic group test for phenolic gp. is:
1. Liebermann's nitroso reaction
2. coupling with diazonium salt
3. aqueous FeCl3
4. all of the above
Phenol can be converted into salicylic acid by
1. Etard's reaction
2. Kolbe's reaction
3. Phenol with CCl4 in basic medium
4. both (2) and (3)
Resorcinol and conc. H2SO4 in presence of phthalic anhydride produce a compound which is:
1. a dye
2. an antiseptic
3. an indicator
4. a detergent
Phenol is weakly acidic but does not react with NaHCO3 like carboxylic acids hence:-
1. phenol is weaker than carbonic acid
2. phenol is stronger than carbonic acid
3. phenol is stronger than carboxylic acid
4. none of the above
An organic compound C7H8O is neither soluble in NaOH nor gives blue colour with FeCl3, is:
(1) C6H5.CH2OH
(2)
(3) C6H5.OCH3
(4) none of these
The electrophile involved in the above reaction is:
1. Dichloromethyl cation ()
2. Dichlorocarbene (:CCl2)
3. Trichloromethyl anion ()
4. Formyl cation ()
Which of the following reagents may be used to distinguish between phenol and benzoic acid?
1. Aqueous NaOH
2. Tollens reagent
3. Molisch reagent
4. Neutral FeCl3