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What is the final product when ethyne reacts with HCN? Is hydrogenation of alkenes and alkynes a syn addition?

  1. What is the final product when ethyne reacts with HCN?
  2. Is hydrogenation of alkenes and alkynes a syn addition?

Grade:12

3 Answers

Sunil Kumar FP
askIITians Faculty 183 Points
9 years ago
1 CHCH +HCN ----------CH2CH(CN)
2)Yes hydrogenation of alkene is a syn addition.The unsaturated substrate is chemisorbed onto the catalyst, with most sites covered by the substrate. In heterogeneous catalysts, hydrogen forms surface hydrides (M-H) from which hydrogens can be transferred to the chemisorbed substrate.Since it is a surface phenomena the reaction takes place with syn aaddtion
Himaja
40 Points
9 years ago
Please explain in detail how adsorption is related to syn and anti orientations in reactions.
Sunil Kumar FP
askIITians Faculty 183 Points
9 years ago
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