What are X and Z in the following reaction sequence?
What are X and Z in the following reaction sequence?
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- CrO\(_3\)/H\(_2\)SO\(_4\); Propiophenone
- CrO\(_3\)/H\(_2\)SO\(_4\); Acetophenone
- PCC; Propiophenone
- PCC; Acetophenone
The Correct Option is A
Solution and Explanation
Propan-1-ol (CH\(_3\)CH\(_2\)CH\(_2\)OH) is a primary alcohol.
Primary alcohols can be oxidized to aldehydes or carboxylic acids.
CrO\(_3\)/H\(_2\)SO\(_4\) (Jones reagent) is a strong oxidizing agent that will oxidize primary alcohols to carboxylic acids.
PCC (pyridinium chlorochromate) is a mild oxidizing agent that will oxidize primary alcohols to aldehydes.
Since the product Y reacts with benzene in the presence of anhydrous AlCl\(_3\), it must be an acid chloride.
Therefore, X must be CrO\(_3\)/H\(_2\)SO\(_4\), which will oxidize propan-1-ol to propanoic acid (CH\(_3\)CH\(_2\)COOH).
Propanoic acid reacts with thionyl chloride (SOCl\(_2\)) to form propanoyl chloride (CH\(_3\)CH\(_2\)COCl).
Y is propanoyl chloride.
This is a Friedel-Crafts acylation reaction.
Propanoyl chloride reacts with benzene to form propiophenone (C\(_6\)H\(_5\)COCH\(_2\)CH\(_3\)).
Z is propiophenone.
Therefore, X is CrO\(_3\)/H\(_2\)SO\(_4\) and Z is propiophenone.
Final Answer:CrO\(_3\)/H\(_2\)SO\(_4\); Propiophenone.
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