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 13 of 55
- A. Chloroform
- B. Acetylene
- C. Divinylacetylene
- D. Chloroprene
Explanation: When acetylene is passed through an acidic solution of cuprous chloride and ammonium chloride and then allowed to stand for several hours…
Correct answer: Chloroprene- A. Mustard gas
- B. Laughing gas
- C. Phosgene gas
- D. Bio-gas
Explanation: 'Mustard gas' a chemical used in World War I. The name comes from its mustard like odour.
Correct answer: Mustard gas- A. Chloroform only
- B. Carbon tetrachloride only
- C. Chloromethane and dichloromethane
- D. Mixture of (a), (b), (c)
Explanation: Halogenation of methane by free radical mechanism.
Correct answer: Mixture of (a), (b), (c)- A. animal
- B. fossil
- C. coal
- D. plant
Explanation: Organic compounds are compounds that contain carbon, usually combined with hydrogen, oxygen, nitrogen, sulfur, or other elements.
Correct answer: plant- A. isomerization
- B. adding (C2H5)4Pb
- C. adding (CH3)4Pb
- D. All of above
Explanation: Octane number is a measure of a gasoline's resistance to knocking or pinging in an internal combustion engine.
Correct answer: All of above- A. aliphatic
- B. alicyclic
- C. aromatic
- D. aldehyde
Explanation: Aromatic hydrocarbons, such as benzene and toluene, have a cyclic, planar structure with alternating single and double bonds.
Correct answer: aromatic- A. 100
- B. 90
- C. 80
- D. 70
Explanation: The octane number is a measure of the anti-knock properties of a fuel. A higher octane number indicates better resistance to knocking in…
Correct answer: 100- A. Boiling point
- B. melting point
- C. percentage composition
- D. Structural formula
Explanation: Both pentane and 2-methylbutane have the same elements (carbon and hydrogen) and the same number of each element (5 carbon atoms and 12…
Correct answer: percentage composition- A. Wohler
- B. Kolbe
- C. Berzelius
- D. Berthelot
Explanation: Organic compounds that are essentially nonpolar and exhibit weak intermolecular forces tend to have low vapor pressure.
Correct answer: Wohler- A. tartaric acid
- B. ethyl alcohol
- C. methanol
- D. urea
Explanation: Friedrich Wohler synthesized urea in 1828 by reacting ammonium chloride and silver cyanate.
Correct answer: urea- A. same
- B. different
- C. depends on number of C atoms
- D. depends on number of H atoms
Explanation: While members of a homologous series share some similar properties due to the same functional group and general formula, the first member…
Correct answer: different- A. carboxylic acid
- B. ketones
- C. aldehydes
- D. polymers
Explanation: Polymers: These are organic compounds formed by the covalent bonding of multiple smaller molecules called monomers.
Correct answer: polymers- A. polymers
- B. monomer
- C. isomer
- D. allotropes
Explanation: Isomers are compounds that have the same molecular formula but different structural formulas.
Correct answer: isomer- A. polar solvents
- B. non-polar solvents
- C. alkalies
- D. water
Explanation: Non-polar solvents:Many organic compounds lack permanent dipoles due to symmetrical carbon chains and electronegativity similarities…
Correct answer: non-polar solvents- A. animals
- B. fossils
- C. wood
- D. all of the above
Explanation: Wood is the primary source material for coal. Decaying woody tissues from ancient forests and swamps undergo the necessary chemical and…
Correct answer: wood- A. .natural gas
- B. good caloric value
- C. cheaper
- D. all
Explanation: a. Natural gas: Methane is a major component of natural gas. Natural gas is primarily composed of methane, and it is used extensively for…
Correct answer: all257. Crude oil is blackish colored liquid produced after the decay of organic matter present between
- A. earth layer
- B. mountains
- C. sedimentary rocks
- D. rocks
Explanation: Crude oil is formed from the decay and transformation of organic matter, such as marine microorganisms, in sedimentary rocks over millions…
Correct answer: sedimentary rocks- A. polymerization
- B. pyrolysis
- C. isomerism
- D. no such process occurs
Explanation: Pyrolysis is a process in which larger molecules, typically with higher molecular weight, are broken down into smaller molecules in the…
Correct answer: pyrolysis- A. structural isomerism
- B. metamerism
- C. cis-trans isomerism
- D. no such process occurs
Explanation: Cis-trans isomerism, also known as geometric isomerism, is a type of stereoisomerism that is characteristic of alkenes.
Correct answer: cis-trans isomerism- A. R-NH2
- B. RCONH2
- C. R-N-R
- D. C6H5NH2
Explanation: RCONH2 represents an amide functional group. In this structure, the carbonyl group (C=O) is bonded to an amino group (NH2)
Correct answer: RCONH2