Reaction Mechanisms: Substitution, Addition, Elimination - Competitive Exam Level

Q. In an addition reaction of HBr to an alkene, what is the major product when the alkene is asymmetric?
  • A. The product with the bromine on the more substituted carbon.
  • B. The product with the bromine on the less substituted carbon.
  • C. A racemic mixture of products.
  • D. No reaction occurs.
Q. In an SN1 reaction, which step is rate-determining?
  • A. Formation of the carbocation
  • B. Nucleophilic attack
  • C. Deprotonation
  • D. Rearrangement
Q. What is the IUPAC name of the compound CH3-CH2-CH(CH3)-CH2-Br?
  • A. 1-bromobutane
  • B. 2-bromobutane
  • C. 3-bromobutane
  • D. 1-bromo-2-methylpropane
Q. What is the major product of the reaction of 2-methylpropene with HBr?
  • A. 2-bromopropane
  • B. 1-bromopropane
  • C. 3-bromopropane
  • D. 2-bromo-2-methylpropane
Q. What is the mechanism of the reaction between 1-bromobutane and sodium hydroxide in ethanol?
  • A. SN1
  • B. SN2
  • C. E1
  • D. E2
Q. What is the mechanism of the reaction between an alkyl halide and a nucleophile in a bimolecular nucleophilic substitution (SN2) reaction?
  • A. The nucleophile attacks the carbon from the opposite side of the leaving group.
  • B. The nucleophile attacks the carbon from the same side as the leaving group.
  • C. The reaction proceeds through a carbocation intermediate.
  • D. The reaction involves the formation of a cyclic intermediate.
Q. What is the product of the reaction between benzyl chloride and sodium hydroxide in water?
  • A. Benzyl alcohol
  • B. Benzyl ether
  • C. Benzyl amine
  • D. Benzyl bromide
Q. Which functional group is present in the compound CH3-COOH?
  • A. Alcohol
  • B. Aldehyde
  • C. Carboxylic acid
  • D. Ester
Q. Which of the following is a characteristic of a nucleophile?
  • A. It donates electrons.
  • B. It accepts electrons.
  • C. It is always neutral.
  • D. It is always positively charged.
Q. Which of the following is a characteristic of an E1 mechanism?
  • A. It involves a concerted mechanism.
  • B. It requires a strong base.
  • C. It forms a carbocation intermediate.
  • D. It occurs only with primary substrates.
Q. Which of the following statements is true regarding nucleophiles?
  • A. They are electron-deficient species.
  • B. They donate electrons to electrophiles.
  • C. They are always negatively charged.
  • D. They cannot be neutral molecules.
Q. Which of the following statements is true regarding the E1 elimination mechanism?
  • A. It involves a concerted mechanism.
  • B. It proceeds through a carbocation intermediate.
  • C. It is favored by strong bases.
  • D. It results in stereospecific products.
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