CSS - PMS - CCE - PCS - General Science
Organic Chemistry - Hydrocarbons
Which process separates crude oil into fractions based largely on boiling range?
A. Chromatography of solids only
B. Filtration only
C. Electrolysis
D. Fractional distillation
Correct Answer: D
Fractional distillation separates petroleum components according to volatility.
CSS - PMS - CCE - PCS - General Science
Organic Chemistry - Hydrocarbons
Crude oil is primarily a complex mixture of what?
A. Metal oxides
B. Proteins
C. Hydrocarbons
D. Pure water
Correct Answer: C
Petroleum contains a wide range of hydrocarbon molecules.
CSS - PMS - CCE - PCS - General Science
Organic Chemistry - Hydrocarbons
What can form during incomplete combustion of hydrocarbons?
A. Only nitrogen
B. Only oxygen
C. Carbon monoxide and/or soot
D. Only water
Correct Answer: C
Insufficient oxygen can produce toxic carbon monoxide and elemental carbon soot.
CSS - PMS - CCE - PCS - General Science
Organic Chemistry - Hydrocarbons
What is the main product of complete combustion of hydrocarbons besides water?
A. Carbon dioxide
B. Hydrogen gas
C. Carbon monoxide only
D. Nitrogen dioxide only
Correct Answer: A
Complete combustion in sufficient oxygen forms CO2 and H2O.
CSS - PMS - CCE - PCS - General Science
Organic Chemistry - Hydrocarbons
What is the general formula of acyclic saturated alkanes?
A. CnH2n−2
B. CnH2n+2
C. CnH2n
D. CnHn
Correct Answer: B
Open-chain alkanes follow CnH2n+2.
CSS - PMS - CCE - PCS - General Science
Organic Chemistry - Hydrocarbons
What is the simplest alkane?
A. Methane
B. Methanol
C. Ethyne
D. Ethene
Correct Answer: A
Methane, CH4, is the simplest alkane.
CSS - PMS - CCE - PCS - General Science
Organic Chemistry - Hydrocarbons
Which class contains at least one carbon-carbon triple bond?
A. Alkenes
B. Esters
C. Alkanes
D. Alkynes
Correct Answer: D
Alkynes contain one or more C≡C triple bonds.
CSS - PMS - CCE - PCS - General Science
Organic Chemistry - Hydrocarbons
Which class contains at least one carbon-carbon double bond?
A. Alkenes
B. Ketones
C. Alkynes only
D. Alkanes
Correct Answer: A
Alkenes are unsaturated hydrocarbons with at least one C=C bond.
CSS - PMS - CCE - PCS - General Science
Organic Chemistry - Hydrocarbons
Which class of hydrocarbons contains only single carbon-carbon bonds?
A. Alkynes
B. Alcohols
C. Alkenes
D. Alkanes
Correct Answer: D
Alkanes are saturated hydrocarbons containing only C−C single bonds.
CSS - PMS - CCE - PCS - General Science
Organic Chemistry - Hydrocarbons
What elements are present in a hydrocarbon?
A. Carbon and oxygen only
B. Carbon and hydrogen only
C. Carbon, hydrogen and sodium
D. Hydrogen and nitrogen only
Correct Answer: B
Hydrocarbons contain only carbon and hydrogen atoms.