Organic Chemistry Flashcards Preview

0 - Chemistry > Organic Chemistry > Flashcards

Flashcards in Organic Chemistry Deck (19):
1

What is (E) isomerism?

Opposite sides of the double bond.

A image thumb
2

What is (Z) isomerism?

Same side of the double bond.

A image thumb
3

What are the three types of structural isomerism?

  1. Chain
  2. Position
  3. Functional group

4

What are the two types of stereoisomerism?

  1. E/Z
  2. Optical

5

What name is given to a carbon atom attached to four different groups?

Chiral

6

What are a pair of optical isomers know as?

Enantiomers

7

What property of optical isomers means there is always a pair?

The two isomers are always non-superimposable

A image thumb
8

What is a racemic mixture?

An equimolar mixture of a pair of enantiomers which results in it being optically inactive

9

What property of the carbonyl groups means racemic mixtures are always formed if the resulting molecule is optically active?

The carbonyl group is planar so can be attacked from above or below with equal probability

10

How can optical isomers be distinguished?

They will rotate the plane of polarisation of plane polarised light in opposite directions

11

What property of carboxylic acids gives them higher boiling points?

They form dimers

A image thumb
12

What is the thermochemical evidence for the structure of benzene?

  • The saturation enthalpy of C=C is -120kJ.mol-1
  • This predicts the saturation of cyclohexatriene to be -360kJ.mol-1
  • The saturation of benzene is actually -208kJ.mol-1
    • The actual saturation is 152kJ.mol-1 less exothermic
    • So benzene is more stable than cyclohexatriene
    • Due to delocalisation of electrons

13

What is the structure of a zwitterion?

A image thumb
14

When amino acids form proteins what bond joins them?

Pepitide bond (amide link)

A image thumb
15

What are the two types of polymer?

  1. Addition
  2. Condensation

16

What are the two types of condensation polymer?

  1. Polyesters
  2. Polyamides

17

What is the repeating unit in terylene?

A image thumb
18

What is the repeating unit in nylon 6,6?

A image thumb
19

What is the repeating unit for kevlar?

A image thumb