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Covalent Molecules
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49 Terms
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1
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What is it called when a Carbon bonds to another Carbon?
Catenation
2
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What solvents are organic molecules soluble in?
Non - polar
3
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Why do hybrid orbitals form?
Energetically favourable
4
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How are Sigma bonds formed?
Overlap of two hybrid orbitals
5
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How are Pi bonds formed?
Combination of two p orbitals
6
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Are Pi orSigma bonds stronger?
Sigma
7
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What type of hybridisation do Carbon Carbon double bonds have?
sp2
8
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What type of hybridisation do Carbon Carbon triple bonds have?
sp
9
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What type of hybridisation does a Carbon Oxygen double bond have?
sp2
10
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What is the bond length of a Carbon Carbon single bond?
1.54
11
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What is the bond length of a Carbon Carbon double bond?
1.34
12
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What is the bond length of a Carbon Carbon triple bond?
1.20
13
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As bond strength increases, bond length _______.
Decreases
14
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What is the name for a benzene ring with a hydroxy group bonded?
Phenol
15
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What is the name for a group of isomers with the same chemical formula but different structures?
Constitutional isomers
16
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If a bond in a Fischer projection is horizontal then it is...
Coming out of the plane (towards you)
17
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If a bond in a Fischer projection is vertical then it is...
Going into the plane (away from you)
18
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If a molecule rotates clockwise its chiral centre is assigned...
R
19
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If a molecule rotates anti-clockwise its chiral centre is assigned...
S
20
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What piece of equipment measures the rotation of an optical molecule?
Polarimeter
21
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What is it important to remember when using a polarimeter?
Use a non-chiral solvent
22
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What is the equation for the observed angle of rotation?
[a]= a/cl
23
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What units is l (path length) in in the equation [a]= a/cl?
dm (10cm = 1dm)
24
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What units is c (concentration) in in the equation [a]= a/cl?
g/ml
25
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What do lots of [a] values also specify?
Temperature and light wavelength
26
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What does a negative [a] value mean?
Light rotated to the left
27
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What do + and - denote in chiral chemistry?
Rotation of polarised light
28
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What are other names used for + and - denotation?
Dextrorotatory (+) and Laevorotatory (-)
29
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Is R and S connected to + and -?
No
30
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What is a diastereomer?
Stereoisomers that are not mirror images
31
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What types of compounds can be diastereomers?
Cyclic and those with more than 1 chiral centre
32
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When is an isomer labelled as 'cis'?
Highest priority groups on same side
33
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When is an isomer labelled as 'trans'?
Highest priority groups on opposite sides
34
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Do diastereomers have the same or different relative stereochemistry?
Different
35
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How many chiral centres must be inverted to go between two diastereomers?
One
36
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How many chiral centres must be inverted to go between two enantiomers?
Both
37
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What are Meso compounds?
Have a chiral centre but are achiral
38
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What are conformers?
Where structures can be interconverted without breaking bonds
39
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What is the 'chair' conformer free of?
Torsional and steric strain
40
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What is an interaction across a ring called?
Transannular
41
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Why is there steric strain in the boat conformer?
Flagpole Hydrogens cause a transannular interaction
42
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Why is there torsional strain in the boat conformer?
Eclipsing of bonds
43
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Is the Chair or Boat conformation more stable?
Chair
44
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When the two interconvertible chair conformers flip the axial bonds become....
equatorial (horizontal)
45
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When the two interconvertible chair conformers flip the equatorial bonds become....
axial (vertical but below plane)
46
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When the two interconvertible chair conformers flip the 'up' substituents remain....
Above the plane
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When the two interconvertible chair conformers flip the 'down' substituents remain....
Below the plane
48
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How many carbons are in the Chair and boat conformers?
Six
49
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What is the degree of strain in a 6 Carbon ring?
-10.5