Question

“I have news!” said Bert excitedly. “What’s new?” you asked. Bert is your friend whom you have known for a

long time and he recently finished his graduate school work in Petrochemical Engineering. He is a couple years

ahead of you and you have always looked up to him for his “science skills”. “I got my first job at a Petrochemical

company” announced Bert. “ I will get to work with crude oil and study properties of the components.” You felt

happy for your friend and your recent experience in your organic chemistry class got you curious about the

‘components of crude oil.’ This idea has really gotten into you and you want to find out more. You asked Dr.

Sharma about this. “Gasoline is a mixture of hydrocarbons from C-5 to C-8. These could be branched or straight

chain molecules” she explained. “But what burns in the engine”, you asked.” “Everything, all hydrocarbons in

Gasoline will burn. Gasoline is a great fuel but often certain additives need to be added to improve its

properties.” She then talked about hydrocarbons, their physical and chemical properties, conformations etc.

She promises to help you apply this new information very soon. You are now very excited about all this new

information about alkanes –a mixture of which is pumped into your car to move around. “Pretty cool!,” you

think.

Later in the week you see a Mini-Case reflection exercise to put your thoughts together about alkanes and

cycloalkanes. Please answer these questions and upload ALL sheets on CANVAS assignment. Use appropriate

ACS method of citation when applicable.

i. Gasoline is made up of alkanes. Write the molecular formula for all alkanes found in gasoline.(1 point)

ii. Draw the line-angle skeletal structures of ALL isomers of heptane and octane that might be present

in gasoline. Provide the systematic name including the IUPAC names of all substituents if

applicable.(Attach additional sheets if required) (7 points)

iii. Considering Octane and its isomers to be the major constituent of gasoline, write a balanced equation

for combustion of the fuel in in internal combustion engine of your car.

Answer 1

i. Answer: molecular formula of all possible mixture of in gasoline are as follows

C_{​​​​​​8}​​​C_​18 , C7H16, C6H14, C5H12.

ii. Answer attached as copy please find attachment.

Isomers of ocatne with names

Isomers of heptane with names

iii. Answer: C_{​​​​​​8}​​​​​H_18(l) +12.5 O_{​​​​​​2(l)} -----> 8CO_{​​​​​2(g)} + 9H_{​​​​​​2}​​​​​O(l)

Balanced chemical combustion reaction of ocatne constitute present in gasoline