8. Which of the following additions to alkenes occurs) specifically in an syn fa

Question

8. Which of the following additions to alkenes occurs) specifically in an syn fashion? A) dihydroxylation using Os04, H202 B) addition of H2 C) hydroboration D) addition of HCI E) A, B, and C Which of the alkyne addition reactions below involve(s) an enol intermediate? A) hydroboration oxidation B) treatment with HgS04 in dilute H2S04 C) hydrogenation D) both A and B E) none of the above 10. What is the product of the following reaction? or CuLi A. C. B. D. 11. What type of reactive intermediate is formed in the reaction of an alkene with Br, and wate r to give a bromohydrin? a. Carbocation b. Carbanion c. Radical d. cyclic bromonium ion 12. In the reaction of an unsymmetrical alkene with a halogen and water to form a halohydrin: a. The halogen adds to the less substituted C because it is more electropositive b. Water adds to the less substituted C because it is more electropositive c. The halogen adds to the more substituted C because it is more electropositive d. Water adds to the more substituted C because it is more electropositive

Explanation / Answer

8) option E is correct

Explanation: Addition of OsO4 to alkene is a syn addition and produces cis-diol as product.

Addition of H2 to alkene is a syn addition.

Hydroboration - oxidation of alkene is a syn addition and adds -OH and -H in syn manner.

9) option D is correct

Explanation: first enol intermediate is formed which is on keto-enol tautomerisation produces carbonyl group.

10) option A is the product.

Explanation: Reaction of organo copper reagent with acid chloride produces ketone as product.

11) The reactive intermediate in formation of bromohydrin is cyclobromonium ion.

12) option D is correct

Related Questions

Navigate

• Browse (All)
• Browse 8
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.