Purity of ether before using it as anaesthetic agent is tested by :-
1. KI + starch
2. CuSO₄
3. H₂SO₄
4. none of these

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

Which of the following undergoes dehydration most readily?

1. 1-phenyl-l-butanol

2. 1-phenyl-2-butanol

3. 2-phenyl-2-butanol

4. 2-phenyl-l-butanol

The enzyme which can catalyse the conversion of glucose to ethanol is:

1. zymase

2. diastase

3. maltase

4. invertase

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 solution test
4. all of the above

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

The electrophile involved in the above reaction is:
1. dichloromethyl cation ($\stackrel{\oplus }{\mathrm{C}}{\mathrm{HCl}}_2$)
2. dichlorocarbene (:CCl₂)
3. trichloromethyl anion ($\stackrel{⊝}{\mathrm{C}}{\mathrm{Cl}}_3$)
4. formyl cation ($\stackrel{\oplus }{\mathrm{C}}\mathrm{HO}$)

On boiling with concentrated hydrobromic acid phenyl ethyl ether 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                                                              [AFMC 1998]

1. C₃H₇OH and CH₃ONa

2. CH₃OH and CH₃ONa

3. C₄H₉OH and C₄H₉ONa

4. C₂H₅OH and C₂H₅ONa