Alkenes and Benzene

Question 1

How does the stability of carbocation relate to the major and minor product in electrophilic addition of HX?

Answer 1

Major product is formed from the more stable carbocation.

Question 2

Describe a C=C bond

Answer 2

One sigma and pi bond

Question 3

How can HCl gas from burning PVC be removed from waste mixture?

Answer 3

Neutralise with a base

Question 4

How does a pi bond form?

Answer 4

Sideways overlap of adjacent p orbitals above and below the bonding atoms.

Question 5

Describe the kekule model of bezne

Answer 5

Alternating single and double bonds

Question 6

What is the product when phenol reacts with dilute HNO3?

Answer 6

A mixture of 2-nitrophenol and 4-nitrophenol

Question 7

What is the shape and bond angle around the C atom in an alkene?

Answer 7

120 and trigonal planar

Question 8

What is the product when phenol reacts with excess Br2?

Answer 8

2,4,6 tribromophenol

Question 9

Why is phenol moe reactive than benzene?

Answer 9

Lone pair of electrons on the O donated into the pi system ,so higher electron density attracts electrophiles more

Question 10

Describe the delocalised model of benzene

Answer 10

Each C atom forms 3 sigma bonds then has a spare electron in a p orbital.6 p orbitals overlap to form a delocalised pi ring.

Question 11

Reacting ethen with hydrogen and a Ni catalyst makes….

Answer 11

Ethane

Question 12

Alkenes and HBr makes….

Answer 12

Bromoalkane