Paper 2 June 2017

Question 1

What’s the conditions for converting a halogenoalkane into an alkene?
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Answer 1

NaOH and Ethanol

Question 2

What’s the conditions to convert a halogrenoalkane into a amine?
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Answer 2

Excess, NH3

Question 3

How do you distinguish between 2 stereoisomers?
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Answer 3

Shine plane polarized light

Enantiomers rotate light in opposite directions

Question 4

Why does the reaction produce a racemic mixture?
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Answer 4

Planar carbonyl group has no rotation
The carbonyl can be attacked from either side
With equal probability

Question 5

How can a compound not show stereoisomerism?
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Answer 5

Doesn’t contain carbon joined to 4 different groups
Symmetrical product
Contains 2 identical groups

Question 6

When can the volume not be measured when calculating Kc?
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Answer 6

When the volumes cancel out

Same number of moles on both side of the equation

Question 7

Name the mechanism when an acyl chloride reacts with a primary amine.

Answer 7

Nucleophilic addition elimination

Question 8

What’s the equation for nitrobenzene and sulfuric acid?

Answer 8

HNO3 + 2H2SO4 –> 2+H3O + 2HS04- + +NO2

Question 9

What’s the mechanism for benzene and nitronium ion?

Answer 9

Electrophilic substitution

Question 10

How does polarity affect molecule affinity?

Answer 10

More polar substances are attracted to the stationary phase so have a smaller Rf value

Question 11

Why are addition polymers not biodegradable?

Answer 11

C—C bonds are very strong and non polar

Nucleophiles cannot attack the bond