Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Chemistry Module 6 > Benzene > Flashcards

Benzene Flashcards

1
Q

Who came up with the original structure of benzene?

A

Kekule

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What were the 3 problems with benzene?

A

Xrays showed bond lengths were all equal as double bonds were thought to be shorter.

Benzene didn’t decolourise bromine water which an alkene should.

Hydrogenation took less due to low bond enthalpy

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Name some structural features of benzene

A

Planar
Trigonal planar, 120°
Aromatic
Contains pi bonds and sigma bonds
6 delocalised electrons

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

How is the delocalised model of benzene different to kekule structure?

A

Shows p orbitals on each carbon atom crossing over sideways to create a pi bond above and below the plane

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

When does the benzene ring become the substitute group?

A

When there are 7 or more carbons or a functional group

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What is the name used when the benzene ring is substitute group?

A

Phenyl

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Outline the mechanism for nitration

A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Outline the mechanism for halogenation

A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Outline the mechanism for alkylation

A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Outline the mechanism for asylation

A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What is the molecular formula for phenol?

A

C6H5OH

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

How is phenol a weak acid?

A

Partially dissociates to give off H+ ions

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Give the equation for phenol Reacting with sodium hydroxide

A

C6H5OH + NAOH > C6H5O-NA+ + H+

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Give the reaction for phenol Reacting with sodium

A

2C6H5OH + 2NA > 2C6H5O-NA+ + H2

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What is the name of C6H5O-NA+ ?

A

Sodium phenoxide

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Why is phenol more reactive than benzene?

A

A lone pair of electrons from the oxygen moves into the ring making ut more negative activating ring

17
Q

Outline the mechanism for the relation of phenol and bromine and what would you observe?

A

C6H5OH + Br3 > C6H2OHBR3 + 3HBr

White precipitate forming

18
Q

Outline the mechanism for nitration of phenol

A

C6H5OH > C6H4OHNO2

Nitrate group on either carbon 2 or 4

Nitric acid with water at 25°c

19
Q

How does phenol form an electrophile?

A

Sufficiently electron dense to induce a dipole in a neighbouring molecule

Chemistry Module 6 (3 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2025 Bold Learning Solutions. Terms and Conditions