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 34 of 55
- A. O & P nitro toluene
- B. M-nitro benzoic acid
- C. M-nitro toluene
- D. O & P nitro benzoic acid
- E. O nitro benzoic acid
Explanation: When benzene is subjected to alkylation, nitration, and oxidation, the product obtained is the option: o- and p-nitrobenzoic acid.
Correct answer: O & P nitro benzoic acid- A. Alkene
- B. Alkyne
- C. Soap
- D. Alkyl halides
- E. Fats
Explanation: The correct answer is option Fat, Option E. The catalytic hydrogenation of oil refers to the process of adding hydrogen (H2) in the…
Correct answer: Fats- A. 2
- B. 3
- C. 4
- D. 5
Explanation: For C₄H₈: n = 4Using formula: 2ⁿ⁻² + 1 = 2⁴⁻² + 1 = 2² + 1 = 4 + 1 = 5 possible isomers.
Correct answer: 5- A. Conjugate bonds
- B. Coordinate covalent bonds
- C. Fixed bonds
- D. Ionic bonds
Explanation: Three alternate single and double bonds in benzene are called conjugate bonds.
Correct answer: Conjugate bonds- A. Alkane
- B. Alkene
- C. Alkyne
- D. Cycloalkane
Explanation: Alkynes are hydrocarbons containing at least one carbon-carbon triple bond.
Correct answer: Alkyne- A. Initiation step
- B. Propagation step
- C. Termination step
- D. Last step
Explanation: In the chlorination of methane, the attack of a chlorine free radical on methane to form a methyl free radical occurs in the propagation…
Correct answer: Propagation step- A. 1:3
- B. 3:1
- C. 4:1
- D. 1:4
Explanation: The ratio of sigma to pi bonds in benzene is 4:1. Benzene has molecular formula C6H6, so there is the presence of one double bond in…
Correct answer: 4:1- A. Alcohol
- B. Butyl alcohol
- C. Propanol
- D. Phenol
Explanation: Phenol is an organic compound that consists of a benzene ring (C6H6) with a hydroxyl group (-OH) attached to it.
Correct answer: Phenol- A. Same molecular mass
- B. Same chemical properties
- C. Same structural formula
- D. Same functional group
Explanation: Two or more compounds having the same molecular formula but different physical, chemical properties and structural formula are called…
Correct answer: Same molecular mass- A. Acetone
- B. 1-propanol
- C. 2-propanol
- D. Acetaldehyde
Explanation: The reaction of propyne with dil. Sulphuric acid, in the presence of HgSO4, is a hydrolysis reaction.
Correct answer: Acetone- A. NO2+
- B. NO2-
- C. NO+
- D. HNO2+
Explanation: Benzene reacts with nitric acid at 50-55°C in the presence of sulphuric acid to form nitrobenzene.
Correct answer: NO2+- A. Hydrometer
- B. Barometer
- C. Calorimeter
- D. Polarimeter
Explanation: A polarimeter is a scientific instrument used to measure the angle of rotation caused by passing polarized light through an optically…
Correct answer: Polarimeter- A. Chain isomerism
- B. Position isomerism
- C. Metameriom isomerism
- D. Tautomerism isomerism
Explanation: Tautomerism is a kind of isomerism in which a single compound exits in 2 or more readily interconvertible forms in equilibrium.
Correct answer: Tautomerism isomerism- A. Cumene
- B. Xylene
- C. Toluene
- D. Cresol
Explanation: Cumene (isopropylbenzene) is an organic compound that contains a benzene ring with an isopropyl substitution.
Correct answer: Cumene- A. Chain isomerism
- B. Meta merism
- C. Tauto merism
- D. Position isomer
Explanation: Tautomerism occurs when the proton's movement is accompanied by a change from an open structure to a ring, such as the open chain and…
Correct answer: Tauto merism- A. 2,3-octadiene
- B. 2,4-octadiene
- C. 2,5-octadiene
- D. 2,5-octadyne
Explanation: The parent chain is 8 carbons long so it is -octa and diene because of the 2 double bonds.
Correct answer: 2,5-octadiene- A. 2-chlorobutane
- B. 2,3-dichloropentane
- C. 2,3-dichlorobutane
- D. 1,2-dichlorobutane
Explanation: Meso isomers have superimposable mirror images and chiral carbons must be present and this compound doesn't have a chiral carbon so it is…
Correct answer: 2,3-dichlorobutane- A. SO2
- B. SO3
- C. SO4
- D. H2SO4
Explanation: When benzene undergoes electrophilic substitution with fuming sulphuric acid (H2SO4), the electrophile involved in the reaction is SO3…
Correct answer: SO3- A. Benzaldehyde > Benzophenone > Acetophenone
- B. Benzophenone > Benzaldehyde > Acetophenone
- C. Acetophenone > Benzaldehyde > Benzophenone
- D. Benzaldehyde > Acetophenone > Benzophenone
Explanation: The reactivity towards nucleophilic addition is influenced by the electron-withdrawing or electron-donating groups present on the aromatic…
Correct answer: Benzaldehyde > Acetophenone > Benzophenone- A. Destructive distillation
- B. Fractional distillation
- C. Steam distillation
- D. Vacuum distillation
Explanation: Michael Faraday discovered benzene in the gas formed from destructive distillation.
Correct answer: Destructive distillation