C2 2019

Question 1

Give an equation for the preparation for the prep of 1,6-diaminohexane by the reaction of 1,6-dibromohexane with excess of ammonia

Answer 1

CH2Br(CH2)4CH2Br + 4NH3 -> CH2(NH2)(CH2)4CH2(NH2) + 2NH4Br

Question 1

State why cyclohexene can be separated from the aq solution using separating funnel

Answer 1

Immiscible
Dont mix / can forms layers

Question 2

Explain why these golf balls do not biodegrade

Answer 2

Non polar C=C bonds and cannot be hydrolysed

Question 3

Suggest a suitable reagent for the hydrolysis

Answer 3

Conc HCl

Question 4

Suggest how the positions of the amino acids on the TLC plate were located

Answer 4

UV light

Question 5

Suggest why it was necessary to use two diff solvents

Answer 5

Some amino acids did not dissolve

Question 6

State why the dicarboxylic acid can be distinguished from the two diols by high resolution mass spectrometry rising electrospray ionisation

Answer 6

The precise masses are different

Question 7

Explain how CO2 causes global warming

Answer 7

CO2 absorb infrared radiation
IR radiation emitted by earth does no escape

Question 8

Explain why NABH4 reduces 2-methylbutanal but has no reaction with 2-methylbut-1-ene

Answer 8

H- ion attracted to delta + C
Electron rich C=C
H- ion repelled by C=C