Organic Chemistry Exam 2

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1

According to the energy diagram of Newman projections, a rotation of __________ degrees has the highest energy.

180

2

According to the energy diagram of Newman projections, a rotation of __________ & __________ degrees has the lowest energy.

0 and 360

3

Lower energy = __________ stable

Higher energy = __________ stable

Lower energy = More stable

Higher energy = Less stable

4

What are two factors that effect the relative stability of Newman projections?

Sterics

Tortional strain

5

What is sterics?

Sterics is when two methyls run into each other because the atoms take up the same space

6

What is tortional strain?

Tortional strain is when two bonds are close together in eclipsed conformers.

7

Which is more stable eclipsed or staggered?

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Staggered

8
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These are __________ reactions

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addition

9
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The arrow points towards one carbon in the double bond and away from the other. What happens to the carbon it points towards?

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It receives the new bond

10
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The arrow points towards one carbon in the double bond and away from the other. What happens to the carbon it points away from?

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It becomes the carbocation

11
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Which reaction is correct and why?

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A because it is secondary and B is primary

12

What is the inductive effect?

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The more carbon-substituted carbon will become the carbocation because it is more stable.

13

Are alkane and cycloalkanes polar or nonpolar?

Nonpolar

14

How do alkanes and cycloalkanes interact?

By dispersion factors

15

Alkanes and cycloalkanes are __________ dense than water.

Less

(they float on water)

16

What is the Cahn-Ingdid-Prelog?

a method of prioritizing substituents based on the atomic numbers of the atoms directly attached to the double bonded carbons.

17

Put these in order from highest to lowest priority:

CH2-OH

CH2-H

CH2-Cl

CH2-CH3

CH2-Cl

CH2-OH

CH2-CH3

CH2-H

18

Which has the highest priority

C-C or C=C

C=C