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Chapter 5: Q8P (page 195)

Question: a. How many vinylic hydrogens does cyclopentene have?

b. How many allylic hydrogens does it have?

Short Answer

Expert verified

Answer-

  1. 2vinylic hydrogens
  2. 4 allylic hydrogens

Step by step solution

01

Definition of vinylic hydrogens

Vinylic carbons are the sp2carbons in an alkene and a vinylic hydrogen is a hydrogen bound to a vinylic carbon.

02

Definition of allylic hydrogens

An allylic carbon is a sp3carbon that is next to a vinylic carbon., whereas an allylic hydrogen is a hydrogen attached to an allylic carbon.

03

Calculating vinylic and allylic carbon in cyclopentene-

  • There are two sp2 hybridized vinylic carbon in cyclopentene and hence it has 2 vinylic hydrogens.
  • Similarly, there are 2 allylic carbons in cyclopentene which has 4 allylic hydrogens.

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Most popular questions from this chapter

a. Which is the most stable: 3,4-dimethyl-2-hexene, 2,3-dimethyl-2-hexene, or 4,5-dimethyl-2-hexene?

b. Which compound has the largest heat of hydrogenation?

c. Which compound has the smallest heat of hydrogenation?

Using curved arrows, show the mechanism of the following reaction:

Draw curved arrows to show the movement of the electrons in each step of the following reaction sequences.

Name the following:

Which is more stable?
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