Question
Answers

Chlorobenzene can be converted to benzene by treatment with $NaOH/CaO$.
(a) True
(b) False

Answer
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Hint: When chlorobenzene is made to react with the sodium hydroxide or the calcium oxide, it results in the formation of the compound which is aromatic in nature and consists of oxygen and sodium atoms attached to it. Now with the help of this, you can easily identify whether the given statement is correct or wrong.

Complete answer:
First of all, let’s discuss chlorobenzene. Chlorobenzene is an aromatic compound. When chlorine is attached to the benzene ring, then the aromatic compound is known as chlorobenzene.
Now considering the statement;
When chlorobenzene is made to undergo reaction with the sodium hydroxide i.e. NaOH , it results in the formation of the sodium phenoxide. The reaction is supposed to occur as;
${{C}_{6}}{{H}_{5}}Cl+NaOH\to {{C}_{6}}{{H}_{5}}ONa$
So, thus Chlorobenzene cannot be converted to benzene by treatment with $NaOH/CaO$ and the given statement is false.

Hence, option (b) is correct.

Additional information:
Chlorobenzene, itself, is formed by the halogenation of the benzene ring in the presence of light. The benzene ring undergoes electrophilic substitution reaction and the hydrogen atom of the benzene ring is replaced by the chlorine atom, thus, resulting in the formation of the chlorobenzene. The reaction is supposed to occur as-



Note:
Chlorobenzene when is treated with the hydrogen in the presence of nickel alloy and sodium hydroxide, it results in the formation of the benzene ring. The reaction is supposed to occur as;
$\,{{C}_{6}}{{H}_{5}}Cl+2H\xrightarrow[NaOH]{Ni-alloy}{{C}_{6}}{{H}_{6}}+HCl$