Arrange their stabilities of given gem-diols in decreasing order.

(a) I > II > III

(b) III > II > I

(c) I > III > II

(d) III > I > II 

What is the product obtained by heating the following allylic ether of phenol?

An acid among the following acids raises the acidity of phenol is:

1. Dil. H₂SO₄       

2. Dil. HCl           

3. Conc. H₂SO₄           

4. Conc. CH₃COOH

; Compounds (X) and (Y) can be differentiated by:
(1) ${\mathrm{H}}_3{\mathrm{O}}^{\oplus }$, NaOI

(2) ${\mathrm{H}}_3{\mathrm{O}}^{\oplus }$, then Fehling test

(3) ${\mathrm{H}}_3{\mathrm{O}}^{\oplus }$, then Na

(4) Both (b) and (c)

Test to differentiate between (CH₃OH) and (Ph-OH) is/are:

1. Litmus test

2. FeCl₃

3. Br₂/H₂O

4. All of these

Methanol and ethanol can be distinguished by the following:

1. By reaction with metallic sodium.

2. By reaction with caustic soda.

3. By heating with iodine and washing soda.

4. By heating with zinc and inorganic mineral acid.

Methylated spirit is:

1. methanol containing some pyridine

2. ethanol containing some methanol

3. pure methanol

4.  95% methanol

Absolute alcohol is prepared from rectified spirit by:

(1) fractional distillation

(2) steam distillation

(3) azeotropic distillation

(4) vacuum distillation

Ethyl alcohol is denatured by:

(1) methanol and formic acid

(2) KCN

(3) CH₃OH and C₆H₆

(4) CH₃OH and pyridine