C₆H₅OH + CHCl₃ + NaOH → salicylaldehyde 

The electrophile involved in the above reaction is. 

Phenol is 

1.  a base weaker than ammonia 

2.  an acid stronger than carbonic acid 

 3.  an acid weaker than carbonic acid 

4.  a neutral compound 

In the following compounds

I. Phenol

II. 4-methyl phenol

III. 3-nitrophenol 

IV. 4-nitrophenol 

 The order of acidity is 

 1. III > IV > I > II 

2. I > IV > III > II 

3. II > I > III > IV 

4. IV > III > I > II 

The lowest pK_a is that of 

(1) Ethanol 

(2) propanol

 (3) propane 

(4) phenol

Picric acid is a yellow coloured compound. Its chemical name is

1.  m-nitrobenzoic acid 

2.  2, 4, 6-trinitrophenol 

 3.  Trinitrotoluene 

4.  trinitroaniline 

The most acidic compound among the following is 

1.  phenol 

2.  Ethanol 

3.  3,5-dinitrophenol 

4.  4-methoxy phenol 

Phenol on treating with concentrated H₂SO₄ at 15–20ºC mainly produces 

(1)  Phenol -2 – sulphonic acid 

(2)  Phenol -4 – sulphonic acid 

(3)  A 50% mixture of ortho and para phenol sulphonic acid 

 (4)  Phenol – 2, 46 – trisulphonic acid 

Assertion (A): Phenols are more acidic than aliphatic alcohols.

Reason (R): Phenoxides are stabilized by resonance. 

(1)  Both A & R are correct, R is the correct explanation of A.

(2)  Both A & R are correct, R is not the correct explanation of A 

(3)  A is correct but R is incorrect 

 (4)  A is incorrect but R is correct 

Phenol on treating with concentrated H₂SO₄ at 100ºC mainly produces

(1)  ortho – phenolsulphonic acid 

 (2)  para – phenolsulphonic acid 

(3) A 50% mixture of ortho – and para – phenolsulphonic acid 

(4)  Phenol – 2, 4, 6 – trisulphonci acid 

Which of the following is most volatile ?

1.  p-nitrophenol 

2.  m-nitrophenol 

3.  o-nitro phenol 

4.  All of these