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Hydrocarbons
Reactions of Alkynes – Partial Reduction (Lindlar Catalyst)
1 question from 1 paper, each with its answer.
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- years asked, 2017–2026
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- of Hydrocarbons
- 1.33%
Concepts tested
- syn addition of hydrogen to an alkyne
All Questions
2019 1 question
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The most suitable reagent for the following conversion is: $H_3C-C\equiv C-CH_3\rightarrow$ cis-2-butene
Partial hydrogenation of an alkyne with Lindlar-type catalyst ($H_2$, Pd/C, quinoline) gives a cis-alkene by syn addition. $H_3C-C\equiv C-CH_3\xrightarrow{H_2,\ Pd/C,\ quinoline}$ cis-2-butene (Na/liquid $NH_3$ would give trans-2-butene.)