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 26 of 55
- A. CnH2n
- B. CnH2n+1
- C. CnH2n-1
- D. CnH2n+2
Explanation: The correct formula for alkenes is CnH2n because alkenes have a double bond between two carbon atoms.
Correct answer: CnH2n- A. Diene
- B. Triene
- C. Polyenes
- D. None of above
Explanation: Diene refers to an alkene that contains two double bonds. The prefix 'di-' signifies two, indicating the presence of two double bonds in…
Correct answer: Diene- A. Ene
- B. Yl
- C. ic
- D. None of these
Explanation: When naming alkenes, the 'ane' suffix is changed to 'ene' to indicate the presence of a double bond.
Correct answer: Ene- A. C-C
- B. C-C-C
- C. C=C
- D. Both a and c
Explanation: The correct answer is Option C:C=C. In alkene structures, carbons are sp2 hybridized with double bonds between them.
Correct answer: C=C- A. 2nd atom
- B. 1st atom
- C. 3rd atom
- D. Last atom
Explanation: The correct answer is Option A: 2nd atom. In 2-pentene, the double bond is designated by the prefix '2-', indicating its location between…
Correct answer: 2nd atom- A. Numbering starts from the end nearest to the double bond, which is the functional group in alkenes.
- B. Numbering starts from the end nearest to the single bond, which is not the functional group in alkenes.
- C. Numbering starts from the end nearest to the triple bond, which is not present in alkenes but in alkynes.
- D. Numbering starts from the end nearest to the hydrogen bond, which is not a functional group in alkenes.
Explanation: When naming alkenes, it is important to start numbering from the end nearest to the double bond, which is the functional group defining…
Correct answer: Numbering starts from the end nearest to the double bond, which is the functional group in alkenes.- A. 2 methyl 2 butene
- B. 1,3 butadiene
- C. 1,2 butadiene
- D. None of above
Explanation: The compound CH2=CH-CH=CH2 is named 1,3 butadiene because it contains 2 double bonds located on the 1st and 3rd carbons.
Correct answer: 1,3 butadiene- A. Ethene, propene and butene
- B. Propene, butene and pentene
- C. Ethene, propene and pentene
- D. Propene, pentene and butene
Explanation: The correct answer is option A: Ethene, propene and butene. The first three members of alkene, ethene, propene, and butene, are gases at…
Correct answer: Ethene, propene and butene- A. Liquids
- B. Gases
- C. Solids
- D. None of these
Explanation: The correct answer is option A:Liquids. Hydrocarbons with carbon chain lengths between C5 to C15 are commonly found in liquid form.
Correct answer: Liquids- A. Water
- B. Alcohol
- C. Ether
- D. Benzene
Explanation: Alkenes are generally soluble in non-polar solvents like benzene because of their similar non-polar nature.
Correct answer: Benzene- A. Sp³ hybridization
- B. Sp² hybridization
- C. Sp hybridization
- D. Dsp² hybridization
Explanation: Alkenes exhibit weakly polar properties because of their sp² hybridization, which results from the presence of a double bond.
Correct answer: Sp² hybridization- A. Unsaturation
- B. Saturation
- C. Addition
- D. Substitution
Explanation: The correct answer is Unsaturation. Double and triple bonds in a compound indicate unsaturation, as they represent the presence of…
Correct answer: Unsaturation- A. 120 kJ/mole
- B. 130 kJ/mole
- C. 125 kJ/mole
- D. 150 kJ/mole
Explanation: The correct answer is Option A: 120 kJ/mole. The heat of hydrogenation of most alkene is about 120 kJ/mole for each double bond present in…
Correct answer: 120 kJ/mole- A. Vegetables ghee from vegetables oil
- B. Vegetables oil from vegetables ghee
- C. Both of these
- D. None of these
Explanation: The correct answer is option A: Vegetables ghee from vegetables oil. Catalytic hydrogenation is a process used in industry for hardening…
Correct answer: Vegetables ghee from vegetables oil- A. Aluminum
- B. Nickel
- C. Copper
- D. Sodium
Explanation: Raney nickel is a specific form of nickel known for its porous surface, making it an effective catalyst.
Correct answer: Nickel- A. 105°C and 3 atm pressure
- B. 100°C and 4 atm pressure
- C. 100°C and 3 atm pressure
- D. 99°C and 3 atm pressure
Explanation: The correct answer is option C: 100°C and 3 atm pressure. This is the typical temperature and pressure for hydrogenation of alkenes over…
Correct answer: 100°C and 3 atm pressure- A. Pink
- B. Red
- C. Blue
- D. Orange
Explanation: The Baeyer's reagent is characterized by its pink color due to the presence of KMnO4.
Correct answer: Pink- A. Reducing agent
- B. Mild oxidizing agent
- C. Both A and B
- D. Not of both
Explanation: Baeyer's reagent acts as a mild oxidizing agent because it contains KMnO4, which is known for its oxidizing properties.
Correct answer: Mild oxidizing agent- A. Wolf kishner reduction
- B. Clemmensen reduction
- C. Baeyer's reagent test
- D. None of these
Explanation: The correct answer is Baeyer's reagent test. This test involves the use of kmno4, which changes color from pink to brown in the presence…
Correct answer: Baeyer's reagent test- A. Hydrogen
- B. Oxygen
- C. Nitrogen
- D. Carbon
Explanation: Ozone is an allotropic form of oxygen, specifically formed from 3 oxygen atoms. This makes Option B, Oxygen, the correct answer.
Correct answer: Oxygen