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 

C₆H₅OH + CHCl₃ + NaOH → salicylaldehyde 

The electrophile involved in the above reaction is. 

The lowest pK_a is that of 

(1) Ethanol 

(2) propanol

 (3) propane 

(4) phenol

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 

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 

Which does not have a carboxyl group ?

1.  Picric acid 

2.  Ethanoic acid 

 3.  Aspirin

4.  Benzoic acid 

In the Libermann’s nitroso reaction, sequential changes in the colour of phenol occurs as 

 (1) Deep blue → red → deep blue 

(2) Red → Deep Blue → Green 

(3) Red → Green →White 

(4) White →Red →Green 

Which of the following is most volatile ?

1.  p-nitrophenol 

2.  m-nitrophenol 

3.  o-nitro phenol 

4.  All of these 

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