Organic

Question 1

4 bonding 0 lone pairs

Answer 1

Tetrahedral

Question 2

3 bonding 1 lone pair

Answer 2

Pyramidal

Question 3

3 bonding 0 lone pairs

Answer 3

Trigonal

Question 4

2 bonding 2 lone pairs

Answer 4

Angular

Question 5

2 bonding 0 lone pairs

Answer 5

Linear

Question 6

Linear angle

Answer 6

180

Question 7

Angular angle

Answer 7

H20= 204.5 
H2S= 102

Question 8

Trigonal angle

Answer 8

120

Question 9

Pyramidal angle

Answer 9

107

Question 10

Tetrahedral angle

Answer 10

109.5

Question 11

Effect of adding a little tetraethyllead to an equimolar mixture of methane and chlorine

Answer 11

Reaction rate increases / tetraethyllead acts as a catalyst

Question 12

Primary alcohol

Answer 12

One carbon attached to hyroxyl carbon

Question 13

Why is boiling point of propanol higher than that of butane?

Answer 13

Propanol is polar/ butane is non-polar /has weaker intermolecular forces

Question 14

Why is the boiling point of ethanoic acid higher than that of prop-1-ol?

Answer 14

Ethanoic acid has more hydrogen bonding / 2 polar groups

Question 15

Organic product of reaction of propanol with acidified dilute KMnO4

Answer 15

Propanoic acid

Question 16

How to demonstrate that ethene readily undergoes an addition reaction with bromine water

Answer 16

Bubble combine ethene with bromine water / red /de colorised

Question 17

Delocalised

Answer 17

Shared between more than two atoms

Question 18

How many electrons in benzene molecule are delocalised

Answer 18

6

Question 19

How many electrons in benzene molecule are involved in sigma bonds

Answer 19

12

Question 20

Molecular formula of eugonol

Answer 20

C10H12O2

Question 21

Name a spectroscopic technique that could help confirm identity of a sample of eugonol

Answer 21

Mass spectrometry/ IR

Question 22

Infrared spectrometry

Answer 22

Molecules absorb of different frequencies

Question 23

a use that propanoic acid, benzoic acid and the salts of these acids have in common

Answer 23

Suits pharmaceutical industry / labour costs high

Question 24

What was observed in flaks as water was dropped onto CAC2 (prepare ethyne)

Answer 24

Reaction turns milky/ bubbling

Question 25

Explain why the first few test tubes of gas collected were discarded (prepare ethyne)

Answer 25

Contain air/ impure

Question 26

Collection of ethen

Answer 26

Side ways test tube/ glass wool and ethanol inside / aluminium oxide

Question 27

Safety precautions during experiment

Answer 27

Keep long hair tied back- avoid burns/ wear mask- avoid contact with chemicals

Question 28

Compare observations made in two tests on ethyne and ethene

Answer 28

Ethyne- flame smokey/ ethene- clean

Question 29

Reagent used to test gases for unsaturation

Answer 29

Bromine

Question 30

Describe how to chemically test sample for unsaturation

Answer 30

Bromine/ acidified pottasium manganate/ decolorises if unsaturated

Question 31

Describe a chemical test to confirm ethanol can be very easily oxidised

Answer 31

Fehling’s solution/ heat/ blue solution reacts to give red

Question 32

Name a laboratory technique to purify impure benzoic acid

Answer 32

Recrystallisation

Question 33

Method to measure melting point of benzoic acid

Answer 33

Sample in test tube in melting point block/ heat slowly/ record melting temp

Question 34

Appearance of phenylmethanol at room temp

Answer 34

Pale yellow/colourless

Question 35

Purify benzoin acid

Answer 35

Sample in melting point tube on melting point block/ heat slowly / note temp when melting occurs