Ch 2 & 4: Hydrocarbons

Question 1

Methane

Answer 1

CH4

Question 2

Ethane

Answer 2

C2H6

Question 3

Propane

Answer 3

C3H8

Question 4

Butane

Answer 4

C4H10

Question 5

Alkanes

Answer 5

C(n)H(2n+2)

Question 6

Alkenes

Answer 6

C(n)H(2n)

Question 7

Ethene

Answer 7

C2H4

Question 8

Propene

Answer 8

C3H6

Question 9

Butene

Answer 9

C4H8

Question 10

Alkynes

Answer 10

C(n)H(2n-2)

Question 11

Ethyne

Answer 11

C2H2

Question 12

Propyne

Answer 12

C3H4

Question 13

Butyne

Answer 13

C4H6

Question 14

Isopropyl

Answer 14

1-methylethyl

Question 15

Isobutyl

Answer 15

2-methylpropyl

Question 16

Sec-Butyl

Answer 16

1-methylpropyl

Question 17

Tert-Butyl

Answer 17

1,1-dimethylethyl

Question 18

Neopentyl

Answer 18

2,2-dimethylpropyl

Question 19

Physical Properties of Alkanes

Answer 19

Alkanes are Water Insoluble and have Relatively Low Boiling Points

Question 20

Torsional Strain

Answer 20

Strain between Eclipsing Groups (Eclipsed Strain)

Question 21

Steric Strain

Answer 21

Strain between atoms too close together (Large Molecules in the Same Area)

Question 22

Inductive Effect

Answer 22

Pulling of Electrons due to Electronegativity

Question 23

What are the two ways something can be an Electron Donating Group (E.D.G.) or Electron Withdrawing Group (E.W.G.)?

Answer 23

Inductive Effect and Resonance

Question 24

Gauche Interactions

Answer 24

Interactions between groups with a 60 Degree Dihedral Angle (Neighboring Groups in Staggered Newman Projection)

Question 25

How is Heat of Combustion related to Relative Stability of Cycloalkanes?

Answer 25

Heat of Combustion per CH2 Groups is inversely proportional to Relative Stability (Higher Heat of Combustion = Lower Stability)

Question 26

List Cyclopropane, Cyclobutane, Cyclopentane, and Cyclohexane in order of decreasing stability

Answer 26

Cyclohexane > Cyclopentane > Cyclobutane > Cyclopropane

Question 27

Ring Strain

Answer 27

Strain of Cycloalkane Conformation