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JEE MAIN Chemistry QUESTION #5581
Question 1
In the reaction sequence $CH_3COOH \xrightarrow{LiAlH_4} A \xrightarrow{PCl_5} B \xrightarrow{Alc.\ KOH} C$, the product C is:
  • Ethylene ($CH_2=CH_2$)✔️
  • Acetyl chloride ($CH_3COCl$)
  • Acetaldehyde ($CH_3CHO$)
  • Acetylene ($HC\equiv CH$)
Correct Answer Explanation
Step 1: $CH_3COOH \xrightarrow{LiAlH_4} CH_3CH_2OH$ (ethanol, A). Step 2: $CH_3CH_2OH \xrightarrow{PCl_5} CH_3CH_2Cl$ (chloroethane, B). Step 3: $CH_3CH_2Cl \xrightarrow{Alc.\ KOH} CH_2=CH_2$ (ethylene/ethene, C) by elimination. The final product C is ethylene.