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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

Question:How would you carry out the following transformations? Tell what

reagents you would use in each case.

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

Question:How would you carry out the following transformations? Tell what

reagents you would use in each case.

(a)

One problem with elimination reactions is that mixtures of products are often formed. For example, treatment of 2-bromo-2-methylbutane with KOH in ethanol yields a mixture of two alkene products. What are their likely structures?

How would you distinguish between the following pairs of compounds using simple chemical tests? Tell what you would do and what you would see.

(a) Cyclopentene and cyclopentane

See all solutions

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