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 53 of 55
- A. Carbinol
- B. Methanol
- C. Ethanol
- D. Glycol
Explanation: Ethylene we know is an alkene They mentioned ethylene is going to react with water, it means it is hydration of an alkene And we know…
Correct answer: Ethanol- A. Water
- B. Ethyle alcohol
- C. Ammonia
- D. Carbon tetrachloride
Explanation: We also know alkenes are non-polar, with negligible electronegativity difference between carbon and hydrogen and no difference between…
Correct answer: Carbon tetrachloride- A. Propylene
- B. Propane
- C. Propene
- D. Propanol
Explanation: To solve such questions, the catalyst tells the whole answer, In the first step alcohol is reacted with PCl3 to form a product A Alcohol…
Correct answer: Propene- A. Water
- B. Ethyle alcohol
- C. Ammonia
- D. Carbon tetrachloride
Explanation: Alkenes are only soluble in nonpolar solvents.
Correct answer: Carbon tetrachloride- A. Nucleophiles
- B. Electrophiles
- C. Carbon ions
- D. Carbonium ions
Explanation: Alkenes undergo electrophilic substitution reaction. Hence in the reaction between ethene and HCl, hydrogen acts as an electrophile and is…
Correct answer: Electrophiles- A. Rropylene
- B. Propane
- C. Propene
- D. Propanol
Explanation: Alcohol reacts with PCl3 to form Alkyl Halides by nucleophilic substitution reaction forming akene (reaction shown below):
Correct answer: Propene- A. Water
- B. Ethyl alcohol
- C. Ammonia
- D. Carbon tetrachloride
Explanation: CCl4 is non polar so as ethene is... They dissolve in each other perfectly because of same nature
Correct answer: Carbon tetrachloride- A. water
- B. ethyl alcohol
- C. ammonia
- D. carbon tetrachloride
Explanation: CCl4 is non polar so alkene dissolves in it best LIKE DISSOLVES LIKE. As, alkenes is non polar so it will dissolve in non polar solvent
Correct answer: carbon tetrachloride- A. Less susceptible to oxidation
- B. More susceptible to oxidation
- C. Equally susceptible to oxidation
- D. All of these
Explanation: A carbon-carbon double bond represents unsaturation, while a single carbon-carbon bond represents saturated hydrocarbons, alkanes that are…
Correct answer: More susceptible to oxidation- A. Addition of bromine water
- B. Addition of HI
- C. Oxidation with ozone
- D. All of the above
Explanation: Ozonolysis, i.e., oxidation with ozone, is the method used to point out the position of a double bond in an organic compound.
Correct answer: Oxidation with ozone- A. 1-pentene
- B. 2-pentene
- C. 2-Methyl-1-butene
- D. 3-Methyl-1-butene
Explanation: The reaction of alkenes with bromine proceeds through the formation of a carbocation intermediate.
Correct answer: 3-Methyl-1-butene- A. 4- Methyl-1-Pentene
- B. 2- Methyl-3- Pentene
- C. 2- Methyl-2- Pentene
- D. 4,4-Dirnethyl-2-Pentene
Explanation: According to the IUPAC system of naming compounds, the methyl group is the substituent that will have secondary importance because the…
Correct answer: 4- Methyl-1-Pentene- A. C5 H22
- B. C5 H10
- C. C5 H8
- D. C4 H10
Explanation: The general formula for alkenes is CnH2n, where n=5 is the formula for alkene C5H10
Correct answer: C5 H10- A. C2H4 > C2H2 > C6H6
- B. C6H6 > C2H4 > C2H2
- C. C2H4 > C2H4 > C6H6
- D. C2H2 > C6H6 > C2H4
Explanation: In electrophilic addition reactions, the reactivity order is C2H4 (alkene) > C2H2 (alkyne) > C6H6 (benzene).
Correct answer: C2H4 > C2H2 > C6H6- A. CH3CHO + CH3CHO
- B. CH3CH2CH2CH2 - OH
- C. CH3CH2CH2COOH
- D. CH3CH2COCH3
Explanation: The correct answer is D:CH3CH2COCH3. When water is added to an alkyne, it typically undergoes a hydration reaction resulting in the…
Correct answer: CH3CH2COCH3- A. Hex-2-ene
- B. Hex-3-ene
- C. 2-methyl pent-1-ene
- D. 2-methyl pent-2-ene
Explanation: d) 2-methyl pent-2-ene:2-methyl pent-2-ene is a five-carbon alkene with a methyl group attached to the second carbon atom and the double…
Correct answer: 2-methyl pent-2-ene- A. CH3-CH-CH2O ⋮ ClOHCl
- B. CH3-CH-CH2Cl ⋮ OH
- C. CH3-CH2-CH2Cl ⋮ OH
- D. CH3-CH-CH2 ⋮ OH
Explanation: The reaction between propene and hypochlorous acid (HOCl) can be represented as follows:CH3CH=CH2 + HOCl → CH3CH(OH)CH2ClThe product…
Correct answer: CH3-CH-CH2Cl ⋮ OH- A. Methane
- B. Ethylene
- C. Ethane
- D. None of the above
Explanation: Option d) "None of the above" is incorrect because ethylene (option b) decolorizes KMnO4 but does not give a precipitate with ammoniacal…
Correct answer: Ethylene- A. 2 - Butene
- B. 2,3 di Methyl-2 Pentene
- C. 2 - Pentene
- D. 1 - Hexene
Explanation: The longest carbon chain is of 5 carbons so the name ends with pentene and since there are two methyl groups as branches so option B is…
Correct answer: 2,3 di Methyl-2 Pentene- A. Alkanes > Alkenes > Alkynes
- B. Alkynes > Alkenes > Alkanes
- C. Alkenes > Alkynes > Alkanes
- D. Alkenes = Alkynes > Alkanes
Explanation: The order of decreasing reactivities for alkanes, alkenes, and alkynes is as follows: alkynes > alkenes > alkanes.
Correct answer: Alkenes > Alkynes > Alkanes