Browse by Stream
QnA
Home
QnA
Go To Your Study Dashboard

Get Answers to all your Questions

header-bg qa
  • Home
  • Engineering
  • Please help! Which of the following reagents may be used to distinguish between phenol and benzoic acid ?

Which of the following reagents may be used to  distinguish between phenol and benzoic acid ?

  • Option 1)

    Aqueous NaOH

  • Option 2)

    Tollen's reagent

  • Option 3)

    Molisch reagent

  • Option 4)

    Neutral FeCl3

 

Answers (1)

best_answer

As we have learned

Phenols / Carbolic acid -

-OH   group is linked directly to aromatic ring system.

- wherein

Simplest\:is\:(C_{6}H_{5}OH)

 

 

Reaction of carboxylic acid with electropositive metals -

A colourless gas (H2) is liberated which give pop sound with burning splinter involves cleavage of  C - OH bond. 

- wherein

2RCOOH+2Na\rightarrow 2RCOONa+H_{2}

 

 Phenols recat with neutral FeCl_3  to form an iron phenol complex 

6C_6H_5OH+ Fe Cl_3\rightarrow [ Fe (OC_6H_5)_6]^{3-}+ 3H^++ 3Cl^-

phenol                                                  iron -phenol complex 

But benzoic acid reacts with FeCl_3  to give a buff coloured ppt of ferric benzoate 

3C_6H_5COOH+ Fe Cl_3\rightarrow [ (C_6H_5COO)_3]Fe + 3HCl

                                                            Ferric benzoate 

 

 

 

 

 

 

 

 


Option 1)

Aqueous NaOH

Option 2)

Tollen's reagent

Option 3)

Molisch reagent

Option 4)

Neutral FeCl3

Posted by

SudhirSol

View full answer

JEE Main high-scoring chapters and topics

Study 40% syllabus and score up to 100% marks in JEE

Similar Questions

Trending Articles/News

anam-khan

JEE Advanced 2024: Chemical engineering cut-offs at IITs; know opening, closing ranks
anam-khan

IIT JEE Mains Result 2024 Session 2: How is overall merit list prepared?
anam-khan

JEE Mains Session 2 result 2024 soon; List of top NITs in India

Latest Question