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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. Calculate the percentage of isopropylcyclohexane molecules that have the isopropyl substituent in an equatorial position at equilibrium. (Its ∆G° value at 25 °C is -2.1 kcal/mol.)

b. Why is the percentage of molecules with the substituent in an equatorial position greater for isopropylcyclohexane than for fluorocyclohexane?

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?

What is the molecular formula for each of the following?

  1. a 4-carbon hydrocarbon with two p bonds and no rings
  2. a 10-carbon hydrocarbon with one p bond and 2 rings

Name the following:

Draw curved arrows to show the movement of the electrons that result in the formation of the given product(s). (Hint: Look at the structure of the product to see what bonds need to be formed and broken in order to arrive at the structure of the desired product.)
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