Phenyl ethyl ether with concentrated hydrobromic acid on boiling yields:-
1. Phenol and ethyl bromide
2. Bromobenzene and ethanol
3. Phenol and ethane
4. Bromobenzene and ethane
An organic compound A reacts with sodium metal and forms B. On heating with conc. H2SO4, A gives diethyl ether. So A and B are:
1. C3H7OH and CH3ONa
2. CH3OH and CH3ONa
3. C4H9OH and C4H9ONa
4. C2H5OH and C2H5ONa
Identify A and predict the type of reactions
1. and substitution reaction
2. and elimination addition reaction
3. and cine substitution reaction
4. and cine substitution reaction
The electrophile involved in the above reaction is:
1. dichloromethyl cation ()
2. dichlorocarbene (:CCl2)
3. trichloromethyl anion ()
4. formyl cation ()
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
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 on oxidation gives chloranil. The oxidant used is:
1. K2S2O8
2. KMnO4
3. KCIO3 + HCl
4. none of these
The enzyme which can catalyse the conversion of glucose to ethanol is:
1. zymase
2. diastase
3. maltase
4. invertase
Which of the following undergoes dehydration most readily?
1. 1-phenyl-1-butanol
2. 1-phenyl-2-butanol
3. 2-phenyl-2-butanol
4. 2-phenyl-1-butanol
An organic compound A reacts with PCl5 to give B. The compound B with sodium metal gives n-butane. Thus, A and B are:
1. C2H5OH and C2H5Cl
2. C2H5Cl and C2H5ONa
3. C3H7OH and CH3CH2CH2OCl
4. C4H9OH and C4H9OCl