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Chapter 8: Q8-12P (page 239)

What products would you obtain from catalytic hydrogenation of the following alkenes?

Short Answer

Expert verified

Alkenes react with hydrogen in presence of either charcoal supported palladium or Pt, to generate the corresponding alkane and the whole reaction is also known as hydrogenation of alkenes. It’s a heterogenous process occurring with syn chemistry because both the hydrogens add from the same face of double bond.

Step by step solution

01

Catalytic hydrogenation

Alkenes react with hydrogen in presence of either charcoal supported palladium or Pt, to generate the corresponding alkane and the whole reaction is also known as hydrogenation of alkenes. It’s a heterogenous process occurring with syn chemistry because both the hydrogens add from the same face of double bond.

02

Explanation

a) The product formed will be 2-methyl pentane.


b) In the product formed, the addition of hydrogens will occur from the same face of the ring, so the product formed will be cis-1,1-dimethyl cyclopentane

c) Here, in the molecule, there is more steric hinderance if the addition of hydrogens occur from below the ring due to presence of isopropyl group at equatorial position. Therefore the addition of hydrogen will occur from above.

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Most popular questions from this chapter

Show the structures of alkenes that give the following products on oxidative cleavage with in acidic solution:


a.CH3CH2CO2H+CO2

Predict the products of the following reactions (the aromatic ring is

unreactive in all cases). Indicate regiochemistry when relevant.

Question: How many alkene products, including E, Z isomers, might be obtained by dehydration of 3-methyl-3-hexanol with aqueous sulfuric acid?

Using an oxidative cleavage reaction, explain how you would distinguish between the following two isomeric dienes:

Question: Which of the following alcohols could notbe made selectively by hydroboration–oxidation of an alkene? Explain.
See all solutions

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