Exam III Prep Flashcards
(82 cards)
1
Q
Alkane General Formula
A
Cn H(2n+2)
2
Q
Cyclohexane General Formula
A
Cn H(2n)
3
Q
Cis
A
Same plane
4
Q
Trans
A
Opposite planes
5
Q
Cis-trans isomer have the same…
A
Molecular formula
Atom connectivity
6
Q
In viewing chair conformations, groups ____________ in one chair are ___________ in the alternative chair
A
Equatorial, Axial
7
Q
A
8
Q
Alkene General Formula
A
Cn H2n
9
Q
Alkyne General Formula
A
CnH(2n-2)
10
Q
______ are saturated and the rest are unsaturated
A
Alkanes
11
Q
-anes
A
C single bonds
12
Q
-enes
A
C double bonds
13
Q
-ynes
A
C triple bonds
14
Q
Methyl group looks like ______
A
A Straight line
15
Q
Ethyl group looks like _______
A
Two connected lines at an angle
16
Q
Propyl group looks like a _______
A
Y
17
Q
Butyl looks like a ________
A
Chicken foot
18
Q
A
19
Q
True or False
Catalytic Reduction of an alkene is syn stereoselective
A
True
20
Q
Borane BH3 is a Lewis acid
A
True
21
Q
Electrophiles are always + charged
A
False
22
Q
Catalytic hydrogenation of cyclohexene gives hexane
A
False
23
Q
Rearrangement will occur in exam of 2-methyl-2-pentene with HBr
A
False
24
Q
All nucleophiles are - charged
A
False
25
In hydroboration, BH3 acts as an electrophile
True
26
In catalytic hydrogenation of an alkene, the reducing agent is H2.
True
27
Alkene addition rxn involve breaking a pi bond and forming to new o bonds
True
28
Foundation of Markivnikov’s rule is the relative stability of carbocation intermediates
True
29
Acid catalyzed hydration of an alkene is regioselective
True
30
The mechanism for addition of HBr to an alkene involves one transition state and two reactive intermediates
False
31
Hydroboration of an alkene is regio and stereo selective
True
32
In acid catalyzed hydration of an alkene, -OH and -H groups added to the double bond both arise from H2O molecule
False
33
Acid catalyzed addition of H2O is called hydration
True
34
If a compound fails to react to Br2, then it is unlikely to have a double Carbon bond
True
35
Addition of Br2 and Cl2 to cyclohexene is stereoselective
True
36
A carbocation is a carbon that has four bonds to it and bears a positive charge
False. Has 3 bonds and is positive
37
Geometry of + charged carbocation is triginal planar
True
38
The carbocation derived by proton transfer to ethylene is CH3CH2+
True
39
The oxygen atom of oxonium ion obeyed the octet rule
True
40
Markovnikov’s rule refers to the regioselectivity of addition rxns to C double bonds
True
41
A rearrangement in which hydride ion shifts will occur in the rxn of 3-methyl-1-pentene with HCl
True
42
Alkenes are good start material for rxns that need to form C-C bond
False
43
Alkynes can be reduced to cis Alkenes
True
44
Enantiomers are always chiral
True
45
An unmarked cube is Chiral
False
46
Stereo centers can be designated using the E Z system
False
47
A chiral molecule will always have a diastereomer
False
48
Every object in nature has a mirror image
True
49
A molecule that has an internal plane of symmetry can never be chiral
True
50
Pairs of enantiomers have the same connectivity
True
51
Enantiomers, like gloves, occur in pairs
True
52
A cyclic molecule with 2 stereocenters will always have only 3 stereoiosmers
False
53
An achiral molecule will always have a diastereomer
False
54
The cis and trans isomers of 2-butene are chiral
False
55
A human foot is chiral
True
56
A compound with n stereocenters will always have 2n stereoisomers
False
57
A molecule with 3 or more stereocenters can not be meso
False
58
Each member of a pair of enantiomers will have the same boiling point
True
59
A molecule with 3 or more stereocenters must be chiral
False
60
If a molecule is not superposable on its mirror image it is chiral
True
61
Constitutional isomers have the same connectivity
False
62
Enenatiomers can be separated by interacting them with the same chiral environment of chemical agent
True
63
Enzymes are achiral molecules that can differentiate chiral molecules
False
64
Cis and trans steroisomers of a cyclic compound can be classified as diastereomer
True
65
3-pentanol is the mirror image of 2 pentanol
False
66
Diastereomers do not have a mirror image
False
67
The most common cause of chiral in organic molecules in the presence of a tetrahedral carbon atom with 4 diff groups bonded to it
True
68
Each member of a pair of enantiomers will have the same density.
True
69
The carbonyl group carbon of an aldehyde or ketone cannot be a stereocenters.
True
70
For a molecule with 3 stereocenters, the maximum number of possible stereoisomers is 32=9
False
71
Diastereomers can be resolved using traditional methods such as distillation
True
72
A racemic moisture is optically inactive
True
73
2-Pentanol and 3-Pentanol are chiral and show enantiomerism
False
74
A diastereomer of a viral molecule must also be chiral
False
75
The group of lowest priority should face away from the viewer to designate configuration of a stereocenter
True
76
A compound with n strikers will always be one of the 2n sterioisomers of that compound
True
77
Each member of a pair of enantiomers could react differently in a chiral environment
True
78
A chiral molecule will always have an enantiomers
True
79
A pair of Diastereomers will have the same boiling point
False
80
A chiral compound is dextrorotatory, its emanations is levorotatory by the same number
True
81
All stereoisomers are optically active
False
82
There are usually equal amounts of each enenatiomer of a chiral biological molecule in a living organism
False
