Free Chemistry of Hydrocarbons MCQs with Answers
1,091 Chemistry of Hydrocarbons MCQs from Chemistry, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Hydrocarbons are studied through the structures and reactions of alkanes, alkenes, alkynes and aromatic compounds. Coverage includes free radical substitution in alkanes, electrophilic addition to carbon-carbon multiple bonds, benzene substitution, aromatic stability and the difference between addition reactions of alkenes and substitution reactions of benzene.
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Read the Chemistry of Hydrocarbons notesFree MDCAT chapter notes with key terms1,091 questions · page 52 of 55
- A. Methanol
- B. Propane
- C. Ethylene
- D. Benzene
Explanation: Upon complete oxidation, propane (C3H8 ) gives 4 moles of water:C3H8+5O2→3CO2+4H2O
Correct answer: Propane- A. Methane
- B. Methylamine
- C. Ethylamine
- D. Methyl chloride
Explanation: When methyl magnesium chloride reacts with ammonia, the product obtained is methane.
Correct answer: Methane- A. C6H14
- B. C6H12
- C. C6H10
- D. C6H0
Explanation: C6H12 follows the formula CnH2n, which is the general formula for cycloalkanes.
Correct answer: C6H12- A. Methane
- B. Methyl amine
- C. Ethyl amine
- D. Methyl chloride
Explanation: CH3-Mg-Cl +NH3 ---------> CH4 + NH2MgCl Grignard reagent/methyl magnesium chloride is basic in nature so it will accept H+ from ammonia…
Correct answer: Methane- A. Consumption of fuel
- B. Price of fuel
- C. The octane number of fueL
- D. Knocking of engine
Explanation: The addition of Pb(C2H5)4 in gasoline reduces knocking in the engine by increasing the octane number of fuel.
Correct answer: Knocking of engine- A. C3H12
- B. C5H16
- C. C6H12
- D. C6H14
Explanation: The formula for 2-methyl pentane is C6H14.
Correct answer: C6H14- A. Polymers
- B. Branched-chain hydrocarbons
- C. Ring hydrocarbons
- D. Branched and ring hydrocarbons
Explanation: Reforming is also called AROMATIZATION and is a process in which open-chain hydrocarbons are converted into branched-chain hydrocarbons
Correct answer: Branched-chain hydrocarbons- A. Reforming
- B. Improving octane number
- C. Adding TEL
- D. All of the above
Explanation: Option D is correct because reforming, improving the octane number, and adding TEL are all methods that help reduce knocking and improve…
Correct answer: All of the above1029. Why is the boiling point of n-Pentane about 28'C higher than that of its 2,2-Dimethylpropane isomer?
- A. The small surface area of 2,2-Dimethylpropane leads to weaker intermolecular forces.
- B. 2,2-Dimethylpropane molecules experience repulsive forces.
- C. N-Pentane molecules have difficulty interacting closely with each other.
- D. Molecular shape has no impact on boiling point.
Explanation: The correct answer is A. The boiling point of a hydrocarbon is influenced by the strength of intermolecular forces, which depend on…
Correct answer: The small surface area of 2,2-Dimethylpropane leads to weaker intermolecular forces.- A. Fossil fuels
- B. Renewable sources
- C. Infiinite sources
- D. None of the above
Explanation: Coal, natural gas and petroleum are all generally called fossil fuels and are nonrenewable sources of energy.
Correct answer: Fossil fuels- A. n-heptane
- B. n-octane
- C. 2,3,3-trimethylpentane
- D. 2,2,4-trimethylpentane
Explanation: The correct answer is 2,2,4-trimethylpentane, also known as isooctane. It is assigned an octane number of 100 because it has excellent…
Correct answer: 2,2,4-trimethylpentane- A. Contact process
- B. Fischer-Tropsch (FT) process
- C. Fermentation process
- D. Haber-Bosch process
Explanation: The Fischer-Tropsch process is the correct answer because it involves the conversion of carbon monoxide and hydrogen into hydrocarbons…
Correct answer: Fischer-Tropsch (FT) process- A. CH4 + 2O2 → CO2 + 2H2O + heat
- B. 2CH4 + 3O2 → 2CO2 + 4H2O + heat
- C. CH3 - CH3 + 7O2 → CO2 + 6H2O + heat
- D. 2CH4 + 2O2 → 2CO + 4H2O + heat
Explanation: When oxygen supply is limited, combustion is incomplete, leading to the formation of carbon monoxide (CO) and water (H2O).
Correct answer: 2CH4 + 2O2 → 2CO + 4H2O + heat- A. Cyclopropane and cyclobutane are liquids at room temperature.
- B. Cycloalkanes are insoluble in ethanol and ether but soluble in water.
- C. Their melting and boiling points show a gradual increase with increases molecular weight.
- D. Both (B) & (C) are correct
Explanation: The longer the alkane gets (higher molecular weight), the more intermolecular forces are present (London Dispersion), and this increases…
Correct answer: Their melting and boiling points show a gradual increase with increases molecular weight.- A. Cyclobutane
- B. Hex-1-ene
- C. Cyclopropane
- D. Propene
Explanation: Hex-1-ene is more stable because the stability of unsaturated hydrocarbons like nitriles, alkenes effects with hyper conjugation.
Correct answer: Hex-1-ene- A. C6H12
- B. C6H14
- C. C5H10
- D. C5H12
Explanation: The equation is as follows: 2 C3H7COONa + 2 H2O→ C6H14 + 2 CO2 + 2 NaOH + H2
Correct answer: C6H14- A. More stable
- B. Less energetic
- C. More reactive
- D. Obey the general formula of normal alkanes
Explanation: Angle strain occurs when bond angles deviate from the ideal bond angles to achieve maximum bond strength in a specific chemical…
Correct answer: More reactive- A. Haber process
- B. Destructive distillation
- C. Fischer - Tropsch process
- D. Fractional distillation
Explanation: Coal can be converted to petroleum through a process known as destructive distillation.
Correct answer: Destructive distillation- A. CO and H2
- B. CO2 and H2
- C. C and H2
- D. All of these
Explanation: The Fischer-Tropsch synthesis involves the formation of alkanes by the combination of carbon monoxide (CO) and hydrogen gas (H2).
Correct answer: CO and H2- A. Coal
- B. Carbon black
- C. Petroleum
- D. Coal tar
Explanation: The term "black gold" is commonly used to refer to petroleum. This nickname comes from the fact that petroleum is a valuable natural…
Correct answer: Petroleum