Exam 14: Conjugated Compounds and Ultraviolet Spectroscopy

Exhibit 14-2 Consider the reaction below to answer the following question(s): -Refer to Exhibit 14-2.The electrophile in this reaction is ____.

​Which of the following is the most likely to happen when a conjugated diene is irradiated with ultraviolet light?

Draw the skeletal formulas for the product of the reaction of the following with HBr.

Which of the following compounds would show the longest wavelength λ_max in its UV spectrum?

Exhibit 14-7 Consider the reaction below to answer the following question(s). -Refer to Exhibit 14-7.This is an example of a(n) ____________ reaction.

Based on the following table,in which compound is the energy difference between the HOMO and LUMO the largest?

When an organic molecule is irradiated with ultraviolet radiation,the energy absorbed by the molecule corresponds to:

​Draw the mechanism of the Diels-Alder reaction between propenal and 2-methyl-1,3-butadiene.

Which of the following has the highest degree of conjugation? Atoms other than carbon and hydrogen are labeled.

Exhibit 14-7 Consider the reaction below to answer the following question(s). -Refer to Exhibit 14-7.The dienophile in the reaction is ____.

​What would be the stereochemistry of the product of the following reaction? ​

For a diene to undergo a Diels-Alder reaction it must:

​Which of the following compounds is the most stable?

If ΔH°_hydrog for a monosubstituted alkene is 126 kJ/mol,which of the following systems is most likely to be a conjugated system?

Exhibit 14-2 Consider the reaction below to answer the following question(s): -Refer to Exhibit 14-2.The product that results from 1,4-addition is _____.

Exhibit 14-2 Consider the reaction below to answer the following question(s): -Refer to Exhibit 14-2.The kinetically controlled product in this reaction is _____.

Exhibit 14-2 Consider the reaction below to answer the following question(s): -Refer to Exhibit 14-2.Write a stepwise mechanism that accounts for both of the products shown.Show all intermediate structures and electron flow with arrows.

Consider the following data for a series of hypothetical plant pigments. Pigment Ε QT7 15,300 XR4 41,000 B78 30,800 L99 10,600 The Absorbance of a solution containing one of these pigments,measured in a 1.00 cm cell,was 0.345.Which pigment was in the solution?

Exhibit 14-2 Consider the reaction below to answer the following question(s): -Refer to Exhibit 14-2.This reaction shows the preferred electrophilic addition of HBr to this unsymmetrical alkene.Draw the products of electrophilic addition to the opposite end of the conjugated diene.

2-Chloro-1,3-butadiene is polymerized to yield an excellent,expensive synthetic rubber with good weather resistance called: