Topic 6 Flashcards
This question is about the reaction of methane with bromine in sunlight.
CH4 + Br2 CH3Br + HBr
This reaction is best described as
a) electrophilic addition
b) electrophilic substitution
c) free radical addition
d) free radical substitution
d
Cracking crude oil…
A separates the mixture into pure compounds.
B separates the mixture into a number of fractions.
C separates saturated compounds from unsaturated ones.
D decreases the average number of carbon atoms per molecule.
d
When methane reacts with chlorine, a mixture of products forms. Which product provides the strongest evidence for a free radical mechanism?
a) C2H6
b) CH3Cl
c) HCl
d) CHCl3
a
Which of the following substances, obtained from the fractional distillation of crude oil, has the lowest boiling temperature? A refinery gas B kerosene C diesel oil D lubricating oil
a
Which of the following is the correct order for the processes used to obtain petrol from petroleum (crude oil)?
a) Petroleum –> fractional distillation –> reforming –> cracking –> petrol
b) Petroleum –> reforming –> fractional distillation –> cracking –> petrol
c) Petroleum –> cracking –> reforming –> fractional distillation –> petrol
d) Petroleum –> fractional distillation –> cracking –> reforming –> petrol
c
An organic compound reacts with chlorine in the presence of ultraviolet light. The relative molecular mass of the product has increased by 34.5 compared with the original compound. What is the reaction mechanism? A Free radical substitution B Electrophilic substitution C Nucleophilic substitution D Free radical addition
a
UV light is useful in initiating some reactions because it
A lowers the activation energy of the reaction.
B causes bonds in molecules to stretch and bend.
C causes molecules to form ions.
D causes molecules to form free radicals.
d
