Question

Chlorobenzene reacts with Mg in dry ether to
give a compound (A) which further reacts with
ethanol to yield
(a) Phenol (b) Benzene
(c) Ethylbenzene (d) Phenyl ether.

Answer 1

Answer:

When chlorobenzene is reacted with magnesium in the presence of dry ether, it results in the formation of phenyl magnesium chloride. This is known as Grignard reagent.

answer --› b) benzene

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Answer 2

Answer:

The answer is b)Benzene

Explanation:

A Grignard reagent is an organomagnesium compound with the chemical formula R-Mg-X, where R denotes an alkyl or aryl group and X denotes a halogen (Cl, Br, or I).

• They're made by reacting an aryl halide or an alkyl halide with magnesium in most cases.
• Grignard processes are generally carried out in solvents like anhydrous diethyl ether or tetrahydrofuran.

(i)In this question given that chlorobenzene reacts with Mg in dry ether gives a compound A. Here chlorobenzene is an aryl halide, when an aryl halide reacts with magnesium metal in presence of dry ether an aryl Grignard reagent will be produced.

(ii)In the next part it is mentioned that when compound X further reacts with ethanol. When aryl or alkyl  Grignard reagent further undergoes a reaction with alcohol giving rise to either benzene or alkane groups.

The reactions are as follows:

Chlorobenzene reacts with Mg in presence of dry ether. It forms a Grignard reagent named benzyl magnesium chloride. These reagent treats with ethanol to yield benzene.

 $C_{6}H_5Cl +Mg$      →  $C_6H_5MgCl +CH_3CH_2OH$     →   $C_6H_6$  $+ C_2H_5OMgCl$  Chlorobenzene      Benzene magnesium Chloride      Benzene