Reaction Mechanism question

🧪 Reaction Mechanism Quiz – Basic to Advanced

Q1. Which type of bond fission leads to the formation of free radicals?

✅ Correct Answer: C
In homolytic cleavage, both atoms get one electron each, forming free radicals.

Q2. Which intermediate is formed during the SN1 reaction?

✅ Correct Answer: C
SN1 involves the formation of a carbocation intermediate in the rate-determining step.

Q3. Which of the following is the most stable carbocation?

✅ Correct Answer: D
3° carbocations are most stable due to hyperconjugation and inductive effect.

Q4. SN2 reaction mechanism involves:

✅ Correct Answer: C
SN2 is a single-step reaction with backside attack leading to inversion of configuration.

Q5. Which reaction follows Markovnikov’s rule?

✅ Correct Answer: C
Electrophilic addition to alkenes usually follows Markovnikov’s rule.

Q6. Which reaction mechanism involves anti-periplanar geometry?

✅ Correct Answer: B
E2 reactions require anti-periplanar arrangement of leaving group and hydrogen.

Q7. Which of the following is not a reactive intermediate?

✅ Correct Answer: C
Ester is a compound, not an intermediate. Others are reactive intermediates.

Q8. What is the rate law for an SN2 reaction?

✅ Correct Answer: C
SN2 is bimolecular, depends on both substrate and nucleophile concentration.

Q9. Which is the correct stability order of free radicals?

✅ Correct Answer: B
More substituted free radicals are more stable: 3° > 2° > 1°.

Q10. Which reaction involves formation of a Meisenheimer complex?

✅ Correct Answer: B
SNAr (nucleophilic aromatic substitution) forms a Meisenheimer intermediate.