Question:
What are A and C in the following sequence of reactions?
\(C_2H_2 \xrightarrow{A} B \xrightarrow{\text{polymerisation}} C\)
What are A and C in the following sequence of reactions?
\(C_2H_2 \xrightarrow{A} B \xrightarrow{\text{polymerisation}} C\)
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Lindlar catalyst stops hydrogenation at alkene stage; full hydrogenation would give alkane.
Updated On: Oct 7, 2026
- \(Pd/H_2\); LDP
- \(Pd/H_2\); HDP
- \(H_2, Pd/C\)-quinoline; LDP
- \(H_2, Pd/C\)-quinoline; HDP
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The Correct Option is D
Solution and Explanation
Concept:
Partial hydrogenation of alkynes gives alkenes using Lindlar’s catalyst, and ethene polymerises to polyethylene.
Step 1: Identify A.
Ethyne is partially hydrogenated to ethene using Lindlar’s catalyst: \[ A = H_2, Pd/C\text{-quinoline} \]
Step 2: Identify C.
Ethene polymerises under high pressure to form High-Density Polyethylene (HDP). \[ C = \text{HDP} \]
Step 3: Match with option.
Correct option is (D). \[ \boxed{H_2, Pd/C\text{-quinoline; HDP}} \]
Step 1: Identify A.
Ethyne is partially hydrogenated to ethene using Lindlar’s catalyst: \[ A = H_2, Pd/C\text{-quinoline} \]
Step 2: Identify C.
Ethene polymerises under high pressure to form High-Density Polyethylene (HDP). \[ C = \text{HDP} \]
Step 3: Match with option.
Correct option is (D). \[ \boxed{H_2, Pd/C\text{-quinoline; HDP}} \]
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