So I already have the answers to the question above but I have to requests to he

Question

So I already have the answers to the question above but I have to requests to help my understanding:

1) May I have a more indepth explanation on how to solve these kinds of problems (How do I know The starting alkyne & reagent)

2) How to find the sum of both of those reactions. (Cis/trans product)

3) Can you show me what to look out for when solving similar problems on my exam.

Describe the alkyne you would start with and the reagents you would use if you wanted to Synthesize a. pentane. b. cis-2-butene. c. trans-2-pentene. d. 1-hexene. Step-by-step solution Step 1 of 4 H2,Pt/C H2CS ECCH2CH2CH3 or CH3C-CCH2???- > CH3CH.CH.CH.CH3 1-pentyne pentane Comments (1) Step 2 of 4 H2, Lindlars 2-butynecatalyst CH3 H3C cis-2-butene Hydrogenation wing H2 is a syn addition, so ti will give cis-product. Lindlar's catalyst is used to prevent further hydrogenation of alkene to an alkane.

Explanation / Answer

To solve such problems, one should have knowledge about nature of reagent used to be in the reaction. For example, H2/Pt gives the complete reduction of reactants whether it's alkene or alkyne ,the product will be an alkane. On the other hand Lindlar's catalyst is used when the reaction is to be stopped at alkene. And when Na in liquid ammonia is used ,it gives trans product. So , ultimately the point is , one should understand the properties of reagent.

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