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Exam 20: Dienes, Conjugated Systems, and Pericyclic Reactions

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Question 21

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Which of the following laws relates absorbance to the concentration of a sample and the pathlength in ultraviolet-visible spectroscopy?

A) Buzz-Beer law
B) Beer-Lambert law
C) Duff-Beer law
D) Christopher-Lambert law

E) A) and D)
F) C) and D)

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Question 22

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A reaction in which two reactants add together in a single step to form a cyclic product is known as a _____. ​ ​

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cycloaddit...

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Question 23

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Which of the following are conjugated dienes?

Consider the reaction below to answer the following question(s). Fill in the blank in the question with the appropriate letter. -This is an example of a(n) ____________ reaction. A. sigmatropic reaction B. electrophillic addition C. Diels-Alder reaction D. Cope rearrangement

Consider the reaction below to answer the following question(s): Enter the appropriate letter in the blank for each the following statements. -The kinetically controlled product in this reaction is _____.

What is (are) the major organic product(s) formed in the following reaction?

For Diels-Alder cycloaddition reactions to take place most rapidly and in highest yield a dienophile must be substituted with electron-donating groups.

Pericyclic reactions occur in a single step with the _____.

Which of the following arrangements of p atomic orbitals gives the lowest energy π-bonding molecular orbital of 1,3-butadiene?

Based on the following table. $\begin{array} { | c | c | } \hline \text { Compound } & \lambda _ { \max } ( \mathbf { n m } ) \\\hline \mathrm { W } & 190 \\\hline \mathrm { X } & 340 \\\hline \mathrm { Y } & 560 \\\hline \mathrm { Z } & 250 \\\hline\end{array}$ Compound ______ has the largest energy difference between the HOMO and LUMO.

What is the IUPAC name of the following compound?

Consider the following reaction. This is an example of a sigmatropic reaction with a [3,3]-shift.

Consider the reaction below to answer the following question(s): Enter the appropriate letter in the blank for each the following statements. -The product that results from 1,4-addition is _____.

Which of the following is(are) formed upon addition of 1 mol of Br₂ to 1,3-cyclohexane?

The following compound could act as a diene in a Diels-Alder reaction.

Which of the following electronic transitions is apparent in the ultraviolet-visible spectrum of 1,3-butadiene?

The following spectrum could arise from π to π* transitions.

What is the IUPAC name of the following compound?

Consider the reaction below to answer the following question(s). Fill in the blank in the question with the appropriate letter. -The dienophile in the reaction is ____.

How would you be able to distinguish between 1,3-cyclohexadiene and 1,4-cyclohexadiene using ultraviolet spectroscopy?