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Benzophenone can be obtained by I. Ben...

Benzophenone can be obtained by
I. Benzoyl chloride +Benzene+`AlCl_(3)`
II. Benzoyl chloride + Diphenyl cadmium ltbr. III. Benzoyl chloride+Phenyl magnesium chloride ltbr. IV. Benzene+ Carbon monoxide+ `ZnCl_(2)`
Select an appropirate option

A

(i) and (ii)

B

(ii) and (iii)

C

(i) and (iii)

D

(i), (ii) and (iii)

Text Solution

AI Generated Solution

The correct Answer is:
To determine which of the given options can yield benzophenone, let's analyze each option step by step. ### Step 1: Analyze Option I **Benzoyl chloride + Benzene + AlCl3** This reaction is a classic example of Friedel-Crafts acylation. In this reaction, benzoyl chloride (C6H5C(O)Cl) reacts with benzene (C6H6) in the presence of anhydrous aluminum chloride (AlCl3) as a catalyst. The AlCl3 helps to generate the acylium ion from benzoyl chloride, which then reacts with benzene to form benzophenone (C6H5C(O)C6H5). **Conclusion:** This option is correct. ### Step 2: Analyze Option II **Benzoyl chloride + Diphenyl cadmium** Diphenyl cadmium (Ph2Cd) can react with benzoyl chloride to form benzophenone. The reaction involves the transfer of the acyl group from benzoyl chloride to the cadmium, resulting in the formation of benzophenone. **Conclusion:** This option is also correct. ### Step 3: Analyze Option III **Benzoyl chloride + Phenyl magnesium chloride** Phenyl magnesium chloride (PhMgCl) is a Grignard reagent. When it reacts with benzoyl chloride, it forms benzophenone through nucleophilic addition followed by hydrolysis. The Grignard reagent attacks the carbonyl carbon of benzoyl chloride, leading to the formation of benzophenone after workup. **Conclusion:** This option is correct as well. ### Step 4: Analyze Option IV **Benzene + Carbon monoxide + ZnCl2** This reaction is known as the Gatterman-Koch reaction, which typically produces benzaldehyde rather than benzophenone. Although benzaldehyde can be further reacted to form benzophenone, this specific reaction does not directly yield benzophenone. **Conclusion:** This option is incorrect. ### Final Conclusion The appropriate options that can yield benzophenone are: - Option I: Benzoyl chloride + Benzene + AlCl3 - Option II: Benzoyl chloride + Diphenyl cadmium - Option III: Benzoyl chloride + Phenyl magnesium chloride
To determine which of the given options can yield benzophenone, let's analyze each option step by step. ### Step 1: Analyze Option I **Benzoyl chloride + Benzene + AlCl3** This reaction is a classic example of Friedel-Crafts acylation. In this reaction, benzoyl chloride (C6H5C(O)Cl) reacts with benzene (C6H6) in the presence of anhydrous aluminum chloride (AlCl3) as a catalyst. The AlCl3 helps to generate the acylium ion from benzoyl chloride, which then reacts with benzene to form benzophenone (C6H5C(O)C6H5). **Conclusion:** This option is correct. ...
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