Question

Chlorobenzene in the presence of NaOH at 623 K, 300 atm pressure gives 'A'. A with water and heating gives B. Identify A and B.

Answer 1

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Answer 2

Answer:

A is sodium phenoxide

B is phenol

Explanation:

When chlorobenzene reacts with NaOH in severe conditions the bond between sp2 hybridised C atom (of the benzene ring) and Cl atom breaks whose place is substituted by ONa- ion [i.e.H+ ion of NaOH and Cl- ion coming from chlorobenzene forms HCl]. This new organic compound (sodium phenoxide is compound A

Again when A is heated with H20, then the H+ion shift occurs between compound A H20. this shift occurs becouse ONa-ion is more acidic than OH- ion (i.e. Na+ dissociates more easily than H+)