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 37 of 55
- A. propene
- B. but-1-ene
- C. but-2-ene
- D. 2,3-dimethyl but-2-ene
Explanation: Terminal double bond on ozonolysis will produce only aldehyde. To form ketone it should not be a terminal alkene.
Correct answer: 2,3-dimethyl but-2-ene- A. CH3CI+HCI
- B. CHCl3+3HCI
- C. CH2Cl2+2HCI
- D. CCI4+4HCI
Explanation: CH4+CI2 → CH3CI+HCICH3CI+ Cl2 → CH2Cl2+HCICH2Cl2 + Cl2 → CHCl3 +HCICHCl3+ Cl2 → CCl4 + HCI
Correct answer: CCI4+4HCI- A. Alkanes
- B. Alkenes
- C. Alkynes
- D. Alcohols
Explanation: This is β-elimination reaction which involves removal of X from α-C and removal of β-H from β-C H X | |-C-C- +KOH → -C=C- +KX+H2O | | | |…
Correct answer: Alkenes- A. An alcoholic base
- B. An alcoholic acid
- C. An alcoholic salt
- D. An alcoholic Grignard reagent
Explanation: In alcoholic medium OH becomes strong base hence it attacks on β-H instead of replacing X from RX.
Correct answer: An alcoholic base- A. 3
- B. 6
- C. 12
- D. 18
Explanation: Benzene consists of six sp2-hybridized carbon atoms each sp2-carbon atoms has 3sp2 hybrid orbital therefore the total number of hybrid…
Correct answer: 18- A. Exothermic process
- B. Isothermic process
- C. Endothermic process
- D. Both A and B
Explanation: The conversion of benzene to cyclohexane is hydrogenation. This process of hydrogenation is an exothermic as it gives out 208kJ/mol of…
Correct answer: Exothermic process- A. Methanol
- B. Ethanol
- C. Methanal
- D. Methanoic acid
Explanation: Explanation for this question will be added soon.
Correct answer: Methanol- A. It takes place in the presence of less polar solvent (like alcohol)
- B. It takes place at high temperature
- C. It requires strong nueleophile (base)
- D. It takes place at low temperature
Explanation: Explanation for this question will be added soon.
Correct answer: It takes place at low temperature- A. SiO2
- B. Conc. H2SO4
- C. Al2O3
- D. H3PO4
Explanation: Explanation for this question will be added soon.
Correct answer: SiO2- A. Nucleophilic addition reactions
- B. Electrophilic addition reaction
- C. Free radical substitution
- D. Nucleophilic substitution reaction
Explanation: The addition of HBr to the alkene is an electrophilic addition reaction.
Correct answer: Electrophilic addition reaction- A. Aluminium triethyl (C2H5)3 only
- B. Titatinum tetrachloride (TiCI4) only
- C. TiCl4 + AlCl3
- D. TiCl4 + Al(C2H5)3
Explanation: Explanation for this question will be added soon.
Correct answer: TiCl4 + Al(C2H5)3- A. Resonance energy
- B. Resonance method
- C. Crystal field theory
- D. Atomic orbital treatment
Explanation: Explanation for this question will be added soon.
Correct answer: Crystal field theory- A. H2C = CH2
- B. R - CH = CH - R
- C. R1R2C = CR3R4
- D. R1R2C = CH3R4
Explanation: This(R - CH = CH - R) represents a generic structure for a disubstituted alkene.
Correct answer: R - CH = CH - R- A. Dehydrohalozenation of vic-dihalides
- B. Dehalogenation of tetrahalides
- C. Electrolysis of aqueous solution of potassium salt of unsaturated dicattoxylic acids
- D. Reaction of calcium carbide with water
Explanation: On industrial scale Ethyne is prepared by the reaction of calcium carbide(CaC2) with water.
Correct answer: Reaction of calcium carbide with water- A. 1
- B. 4
- C. 2
- D. 3
Explanation: The preparation of acetaldehyde from ethyne (acetylene) and water in the presence of HgSO4/H2SO4 at 75°C involves two steps.The overall…
Correct answer: 2- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: in addition reaction Molar mass of the adduct may increase or decrease than that of The initial molecule and in substitution reaction…
Correct answer: Option B- A. 1 ,3-Pentadiene
- B. 2,4-Pentadiene
- C. 2,3-Pentadiene
- D. 1,4-Pentadiene
Explanation: Explanation for this question will be added soon.
Correct answer: 1 ,3-Pentadiene- A. CHCl3
- B. CCl4
- C. CH2Cl2, CH3Cl
- D. All of these
Explanation: Alkanes react with chlorine and bromine in the presence of sunlight or UV light or at high temperature resulting in the successive…
Correct answer: All of these- A. The two isomers of benzene
- B. The isomers of arenes
- C. The two-resonance structure of benzene
- D. The two-resonance structure of phenols
Explanation: The Kekulé structures are two resonance structures that were proposed by Friedrich August Kekulé to represent the bonding in benzene.
Correct answer: The two-resonance structure of benzene- A. Alkanes
- B. Alkynes
- C. Carbonyl
- D. Alkenes
Explanation: Alkynes have a triple bond between two carbon atoms. This means that there are three bonds connecting the carbons: one sigma bond and two…
Correct answer: Alkynes