All Free Chemistry MCQs with Answers

• A. C3H12
• B. C5H16
• C. C6H12
• D. C6H14

Explanation: The formula for 2-methyl pentane is 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

• 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…

• 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…

• 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.

• 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…

• 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…

• 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).

• 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…

• 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.

• A. C6H12
• B. C6H14
• C. C5H10
• D. C5H12

Explanation: The equation is as follows: 2 C3H7COONa + 2 H2O→ C6H14 + 2 CO2 + 2 NaOH + H2

• 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…

• 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.

• 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).

• 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…

• A. Carbinol
• B. Methanol
• C. Ethanol
• D. Glycol

Explanation: Ethylene we know is an alkene They mentioned ethylene is going to react with water, it means it is hydration of an alkene And we know…

• A. Water
• B. Ethyle alcohol
• C. Ammonia
• D. Carbon tetrachloride

Explanation: We also know alkenes are non-polar, with negligible electronegativity difference between carbon and hydrogen and no difference between…

• A. Propylene
• B. Propane
• C. Propene
• D. Propanol

Explanation: To solve such questions, the catalyst tells the whole answer, In the first step alcohol is reacted with PCl3 to form a product A Alcohol…

• A. Water
• B. Ethyle alcohol
• C. Ammonia
• D. Carbon tetrachloride

Explanation: Alkenes are only soluble in nonpolar solvents.

• A. Nucleophiles
• B. Electrophiles
• C. Carbon ions
• D. Carbonium ions

Explanation: Alkenes undergo electrophilic substitution reaction. Hence in the reaction between ethene and HCl, hydrogen acts as an electrophile and is…