ITOC exam questions

Question 1

which alkene shows E-Z isomerism?
a) 2,3-dimethylbut-2-ene
b) 4-methylpent-2-ene
c)methylpropene
d) pent-1-ene

Answer 1

b) 4-methylpent-2-ene

Question 2

the question below refers to the reaction of 1-bromopropane with a solution of potassium cyanide in aqueous ethanol.
What is the correct mechanism for the reaction?

Answer 2

B

Question 3

which compound has E-Z isomers?
a) CH2=CHBr
b) CH2=CBr2
c) CHBr=CHBr
d) CBr2=CHBr

Answer 3

c) CHBr=CHBr

Question 4

which is the correct formula for non cyclic compounds in the homologous series?
a) alcohols CnH2n+2 O
b) aldehydes CnH2n+1O
c) esters CnH2n+1O2
d) CnH2n+2N

Answer 4

a) alcohols

Question 5

which compound has the lowest relative molecular mass?
a) ethanoic acid
b) 1-fluroepropane
c) propane nitrile
d) propylamine

Answer 5

c) propanenitrile

Question 6

describe how you distinguish between separate samples of the two enantiomers of the branched chain aldehyde C5H10O?
(2 marks)

Answer 6

M1: use plane polarised light
M2: rotates the plane of in opposite directions