Bromobenzene reacts with Mg indriy ether give a compound grignard reagent ( phenyl magnesium bromide )
and ethanol is not stronger acid so when it reacts with grignard reagent , it will protonate and forms benzene

Bromobenzene reacts with Mg in dry ether to give a compound A. Compound A is then further reacted with ethanol to yield benzene. Let's break down the reaction steps and explain why the correct answer is option 'B'.

Step 1: Reaction of Bromobenzene with Mg in dry ether
- In this step, bromobenzene (C6H5Br) reacts with magnesium (Mg) in dry ether (C2H5OC2H5) as the solvent.
- The reaction is a Grignard reaction, which involves the formation of a carbon-magnesium bond.
- The bromine atom in bromobenzene is replaced by a magnesium atom, resulting in the formation of phenylmagnesium bromide (C6H5MgBr).
- The reaction can be represented as follows:
C6H5Br + Mg → C6H5MgBr

Step 2: Reaction of Compound A (Phenylmagnesium Bromide) with Ethanol
- In this step, compound A (phenylmagnesium bromide) reacts with ethanol (C2H5OH) as the reagent.
- The reaction is a nucleophilic substitution reaction, where the phenylmagnesium bromide acts as a nucleophile and attacks the electrophilic carbon of the ethanol molecule.
- This leads to the formation of benzene (C6H6) and magnesium bromide (MgBr2) as byproduct.
- The reaction can be represented as follows:
C6H5MgBr + C2H5OH → C6H6 + MgBr2 + C2H5OMgBr

Explanation of the Correct Answer:

The correct answer is option 'B', which states that the product formed is benzene. This is because compound A (phenylmagnesium bromide) reacts with ethanol to yield benzene. This reaction is known as a dehalogenation reaction, where the halogen atom (in this case, bromine) is replaced by a hydrogen atom. The resulting compound is benzene, which is a cyclic aromatic hydrocarbon.

Option 'A' (phenol) is incorrect because phenol is not formed in the given reaction sequence. Phenol is a compound that contains a hydroxyl group (-OH) attached to an aromatic ring. However, in the given reaction, there is no introduction of a hydroxyl group.

Option 'C' (ethyl benzene) is incorrect because ethyl benzene is not formed in the given reaction sequence. Ethyl benzene is a compound that contains an ethyl group (-C2H5) attached to an aromatic ring. However, in the given reaction, there is no introduction of an ethyl group.

Option 'D' (phenyl ether) is incorrect because phenyl ether is not formed in the given reaction sequence. Phenyl ether is a compound that contains an oxygen atom (-O-) linking two aromatic rings. However, in the given reaction, there is no introduction of an oxygen atom.

In conclusion, the correct answer is option 'B' (benzene) because the reaction of compound A with ethanol yields benzene.