1. benzene and its structure

Question 1

benzene is the simplest member of what homologous series

Answer 1

arene

Question 2

molecular formula of benzene

Answer 2

C6H6

Question 3

empirical formula of benzene

Answer 3

CH

Question 4

why don’t we use benzene in the lab

Answer 4

Carcinogen

Question 5

what physical state is benzene at room temperature

Answer 5

liquid

Question 6

what was kekules model of benzene (1850s)

Answer 6

6 membered ring with alternating single and double bonds

Question 7

problem with kekules model in terms of reactions

Answer 7

benzene resistant to addition reactions (unlike alkenes)

Question 8

problems in terms of bond length

Answer 8

x-ray diffraction techniques find all bond lengths are the same

Question 9

problems in terms of enthalpy of hydrogenation

Answer 9

shows benzene is 152 kJ mol-1 more stable than expected

Question 10

explanation of delocalised ring of electrons

Answer 10

electrons in adjacent p orbitals overlap sideways
forming a delocalised pi system/ ring
each C atom donates 1 electron

Question 11

why is benzene very stable and resistant to addition reaction

Answer 11

a lot of energy is required to disrupt delocalisation