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 45 of 55
- A. CO2 & H2O
- B. CO & H2O
- C. CO2 & H2
- D. CH3OH
Explanation: Catalytic oxidation of lower alkanes takes place in the presence of a metallic catalyst, for example, Cu, at high temperature and…
Correct answer: CH3OH- A. Reforming
- B. Cracking
- C. Isomers
- D. Decomposition
Explanation: Reforming is a catalytic process in which straight- chain molecules are converted to branched forms. Hence, option A is correct
Correct answer: Reforming- A. 0
- B. 100
- C. 40
- D. 98
Explanation: If there is pure n-heptane, then its octane number is 0. n-heptane has zero octane number because of very poor knock resistance.
Correct answer: 0- A. Decrease the boiling point
- B. Prevent heating
- C. Prevent freezing of fuel
- D. Prevent knocking
Explanation: Organic lead (tetraethyl lead; TEL) is used as an antiknock agent in gasoline and jet fuels. It increases the octane number of the fuel.
Correct answer: Prevent knocking- A. Tetramethyl lead
- B. Tetraethyl lead
- C. Iso-octane
- D. All of these
Explanation: Option A is incorrect as tetramethyl lead doesn't have anti-knocking properties.
Correct answer: Tetraethyl lead- A. C- C
- B. C-H
- C. Both C-C and C-H
- D. C-0
Explanation: Cracking is the process whereby complex organic molecules such as long-chain hydrocarbons are broken down into simpler molecules such as…
Correct answer: C- C- A. C-C
- B. C-H
- C. Both C-C and C-H
- D. C-O
Explanation: The primary types of bonds that are broken during cracking are C-C bonds.
Correct answer: C-C- A. Cracking
- B. Hydrolysis
- C. Oxidation
- D. Distillation
Explanation: Cracking is the process in which long chain hydrocarbons (in liquid/solid state) are broken into short chain, more useful hydrocarbons…
Correct answer: Cracking- A. C-C
- B. C-H
- C. Both C-C and C-H
- D. C-O
Explanation: Option A is correct as cracking is the breakdown of very large chains of carbon into smaller chains by breaking the "Carbon to Carbon…
Correct answer: C-C- A. Methane
- B. Ethane
- C. Propane
- D. Butane
Explanation: a) Methane: Methane is indeed called "marsh gas." It is the simplest hydrocarbon with the chemical formula CH4.
Correct answer: Methane- A. Silica, lime
- B. Silica, alumina
- C. Silica, Soda ash
- D. Alumina,Pt
Explanation: Option B is correct since silica and alumina are used in catalytic cracking to produce smaller more useful fractions from larger…
Correct answer: Silica, alumina892. Alkanes are called?
- A. Olefines.
- B. Paraffins.
- C. Reactive.
- D. All of these.
Explanation: Paraffin is a term that was originally used to describe a waxy substance that was obtained from petroleum.
Correct answer: Paraffins.- A. Higher the octane number, higher will be the knocking.
- B. Higher the octane number, the efficiency of fuel will be lower.
- C. Higher the octane number, lower the knocking.
- D. Lower the octane number, lower the knocking.
Explanation: Higher octane numbers in gasoline indicate that the fuel is more resistant to knocking, which is a type of uncontrolled combustion that…
Correct answer: Higher the octane number, lower the knocking.- A. 0
- B. 100
- C. 40
- D. 98
Explanation: Option A: n-Heptane (C7H16) has an octane number of 0. Option B: iso-octane (C8H18) has an octane number of 100.
Correct answer: 0- A. Alkene
- B. Alkyne
- C. Alkane
- D. Cycloalkene
Explanation: The correct answer is: Alkane An alkane is a hydrocarbon compound in which all carbon atoms are fully saturated with single covalent…
Correct answer: Alkane- A. Alkanes
- B. Alkenes
- C. Alkynes
- D. All of these options are correct
Explanation: In the alkane series, all the carbon atoms are bonded through C-C single bonds.
Correct answer: Alkanes- A. Steam cracking
- B. Reforming
- C. Catalytic cracking
- D. Distillation
Explanation: The octane number of gasoline is improved by a process called reforming.
Correct answer: Reforming- A. The higher the octane number, the higher will be knocking
- B. Higher the octane number, the efficiency of the fuel will be lower
- C. The higher the octane number, lower will be the knocking
- D. Lower the octane number, lower the knocking
Explanation: The octane number of a fuel represents the quality of fuel, the higher the octane number, the higher the fuel quality and the lesser the…
Correct answer: The higher the octane number, lower will be the knocking- A. Olefines
- B. Paraffins
- C. Reactive
- D. All of these options are correct
Explanation: Alkanes are also called paraffins, while alkenes are also called olefins.
Correct answer: Paraffins- A. Cracking
- B. Hydrolysis
- C. Oxidation
- D. Distillation
Explanation: Correct option is A. Cracking is defined as a process, where in complex organic molecules namely long chain hydrocarbons or kerogens are…
Correct answer: Cracking