Benzene

Question 1

What is position 1 called in benzene?

Answer 1

ipso

Question 2

What is position 2 called in benzene?

Answer 2

ortho

Question 3

What is position 3 called in benzene?

Answer 3

meta

Question 4

What is position 4 called in benzene?

Answer 4

para

Question 5

Describe the bonding in benzene

Answer 5

Sp2 hybridized C atoms
Delocalised π-e-
Planar molecule
Each C has 120 degrees bond angle

Question 6

What is 1st stage of Ar-Se?

Answer 6

Energy rises as E+ approaches

= interacts with π-system

Question 7

What is 2nd stage of Ar-Se?

Answer 7

π-system disrupted in 1st transition state

Partial sigma-bond between 1 ring of C + incoming E+

Question 8

What is 3rd stage of Ar-Se?

Answer 8

From 1st transition state reaction proceeds to form sigma complex = Wheland intermediate

Question 9

What is 4th stage of Ar-Se?

Answer 9

Wheland contains Sp3 hybridized C

Question 10

What is the final stage of Ar-Se?

Answer 10

2nd transition state contains partial bond to H

Loss which = rearomatization

Question 11

Wheland intermediate resonance forms + graph

Answer 11

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