Exam 2

Question 1

which of the following statements about alkanes is NOT true : A. they are aliphatic hydrocrabons B. contains only C-C and C-H bonds C. are acyclic or cyclic d. ayclic alkanes have two fewer H atoms than cyclic alkanes wit the same number of carbons

Answer 1

D) ayclic alkanes have two fewer H atoms than cyclic alkanes wit the same number of carbons

Question 2

cyclic or ayclic alkanes: have two fewer H atoms than cyclic alkanes wit the same number of carbons

Answer 2

cyclic

Question 3

when it comes to acyclic alkanes, rotating atoms on one carbon by how many degrees converts an eclipsed conformation into what kind of conformation and vice versa?

Answer 3

60, staggered

Question 4

T/F: when it comes acylclic alkanes, the staggered and eclipsed conformations are equally stable

Answer 4

false

Question 5

T/F: Gauche conformations are generally higher in energy than anti conformations

Answer 5

true

Question 6

what are the products of the combustion of alkanes?

Answer 6

carbon dioxide and water

Question 7

what is the main carbohydrate in the seeds and roots of plants

Answer 7

starch

Question 8

T/F: in cellulose, the O atom joins two rings using two equatorial bonds

Answer 8

true

Question 9

T/F: constitutional isomers always have the same functional groups

Answer 9

false

Question 10

T/F: stereoisomers differ only in their structural formula

Answer 10

false

Question 11

the existence of molecule that is not superimposable on its mirror image

Answer 11

chirality

Question 12

T/F: a molecule that is superimposable on its mirror image is said to be chiral

Answer 12

false

Question 13

T/F: enantiomers are mirror images that are not superimposable

Answer 13

true

Question 14

T/F: achrial molecules usually contain a plane of symmetry

Answer 14

true

Question 15

a pair of steroisomers that are not superimposable mirror images of each other

Answer 15

enantiomers

Question 16

T/F: steroisomers that are not superimposable on their mirror images are enantiomers

Answer 16

true

Question 17

how many steroisomers are possible for a molecule with formula: CH3CHBrCH(OH)CH3

Answer 17

four

Question 18

how man y steroisomers are possible for a molecule with formula: CH3CH(OH)CH(OH)CH3

Answer 18

three

Question 19

how many isomers can be drawn (constitutional and stereo) for dimethcyclopropane

Answer 19

four

Question 20

how many chiral steroisomers can be drawn for dimethcyclopropane

Answer 20

2

Question 21

T/F: a meso compound is chiral

Answer 21

false

Question 22

how many steroisomers of 1,3 dibromocyclopentane exist?

Answer 22

3