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.
Last updated
Read the Chemistry of Hydrocarbons notesFree MDCAT chapter notes with key terms1,091 questions · page 27 of 55
- A. Carbonyl compounds
- B. Alkynes
- C. Alkanes
- D. Alkyl compound
Explanation: The reduction of ozonides, which are formed from the ozonolysis of alkenes, produces carbonyl compounds.
Correct answer: Carbonyl compounds522. In this process small organic molecules (monomer) combine together to form Larger molecules known as
- A. Combustion
- B. Addition
- C. Reduction
- D. Polymers
Explanation: The correct answer is 'Polymers' because in this process, small organic molecules (monomers) combine together to form larger molecules…
Correct answer: Polymers- A. 200°C and 2000 atm
- B. 500°C and 200 atm
- C. 400°C and 100 atm
- D. 400°C and 200 atm
Explanation: The correct conditions for polymerizing ethene to polyethylene involve a combination of high pressure and moderate temperature.
Correct answer: 200°C and 2000 atm- A. From alkynes
- B. Removal of vicinal dihalides
- C. Acidic dehydrogenation
- D. Dehydrohalogenation
Explanation: The correct answer is 'Dehydrohalogenation' because it accurately describes the reaction process of converting chloroethane to ethene by…
Correct answer: Dehydrohalogenation- A. Saturated
- B. Unsaturated
- C. Polar
- D. Non polar
Explanation: Alkenes are unsaturated hydrocarbons because they contain one or more double bonds, which results in them having fewer hydrogen atoms than…
Correct answer: Unsaturated- A. Solids
- B. Liquids
- C. Gases
- D. Plasma
Explanation: Higher members of alkenes refer to those with a greater number of carbon atoms.
Correct answer: Solids- A. Hydrogenation
- B. Halogenation
- C. Dehydration
- D. Dehydrohalogenation
Explanation: The correct answer is 'Hydrogenation.' This process specifically involves the addition of a hydrogen molecule across a carbon-carbon…
Correct answer: Hydrogenation- A. 0.1 mg
- B. 1 mg
- C. 10 mg
- D. 100 mg
Explanation: The correct answer is 0.1 mg. Only a very small amount of ethene is required for the ripening of 1 kg of tomatoes.
Correct answer: 0.1 mg- A. Solid
- B. Liquid
- C. Gas
- D. Plasma
Explanation: The correct answer is Option B:Liquid. Alkenes with carbon atoms ranging from C5 to C15 are in a liquid state.
Correct answer: Liquid- A. Saturated
- B. Unsaturated
- C. Super Saturated
- D. Super unsaturated
Explanation: Alkenes are classified as unsaturated hydrocarbons because they contain double bonds between carbon atoms.
Correct answer: Unsaturated- A. Polar
- B. Non polar
- C. Unreactive
- D. Stable
Explanation: The correct answer is 'Polar'. Alkenes with C=C bonds have a high electron density area due to the pi bond, making them weakly polar.
Correct answer: Polar- A. Alkane
- B. Alkenes
- C. Alkyne
- D. None
Explanation: Hydrocarbons containing double bonds are called alkenes. Double bonds are characteristic of alkenes, while alkynes have triple bonds and…
Correct answer: Alkenes- A. Only structural
- B. Only geometrical
- C. Both geometrical and structural
- D. Neither geometrical nor structural
Explanation: Alkenes exhibit both geometrical and structural isomerism. Geometrical isomerism arises from different groups attached to the carbon atoms…
Correct answer: Both geometrical and structural- A. Anti-Markovnikov's rule
- B. Markovnikov's rule
- C. Kharish effect
- D. Peroxide effect
Explanation: According to Markovnikov's rule, during the addition of hydrogen bromide (HBr) to an unsymmetrical alkene, the hydrogen atom will attach…
Correct answer: Markovnikov's rule- A. Sigma-bond only
- B. pi-bond only
- C. lone pairs
- D. Sigma and pi-bond
Explanation: The double bond in ethene is formed from both a sigma bond and a pi bond.
Correct answer: Sigma and pi-bond- A. Isomer
- B. Polymer
- C. Isotope
- D. Monomer
Explanation: Ethene (C2H4) can undergo polymerization under certain conditions, where multiple ethene molecules combine to form a chain-like structure…
Correct answer: Polymer- A. Triol
- B. Butanol
- C. Ethanol
- D. Propanol
Explanation: When ethene undergoes hydration, it forms ethanol, a two-carbon alcohol.
Correct answer: Ethanol- A. Addition reaction
- B. Elimination reaction
- C. Substitution reaction
- D. None of them
Explanation: Alkenes predominantly undergo addition reactions due to their double bond's electron-rich nature.
Correct answer: Addition reaction- A. Volatility
- B. Polarity
- C. Boiling point
- D. None
Explanation: The statement is correct because as the molar mass of hydrocarbons decreases, their volatility increases.
Correct answer: Volatility- A. Cryolite
- B. Zeolite
- C. Bauxite
- D. Alcoxite
Explanation: Zeolite is indeed the correct answer as it is a commonly used catalyst in the petrochemical industry for breaking down hydrocarbons like…
Correct answer: Zeolite