problem # 17 16. Which reaction would give the alkene? a) Butyl acetylene+ HBr (

Question

problem # 17

16. Which reaction would give the alkene? a) Butyl acetylene+ HBr (1 eq.) b) Methyl acetylene + Br2 (2 eq.) c) 2.2-Dibromopentane + NaOCHs (excess) d) Pent-2-yne + HCl/H20 17. Which of reactions below does not involve(s) an enol intermediate? a) oxymercuration-demercuration on 1-pentyne b) bromination of 2-pentyne c) acid-cat. hydration on 1-pentyne d) hydroboration on 2-pentyne 18. What is the major product of the following reaction? CH3C CH HC excess A) Cl CH 3CH2CH cl B) ci CH3-C-CH 3 cl C) CH3CH-CH-C D) CH3C=CH 2 C1 E) CH3C CH ci cl

Explanation / Answer

17) option B is correct

Explanation: bromination of 2-pentyne does not involve an enol intermediate. Addition of Br2 to alkyne involves a cyclobromonium cation which on further reaction with bromide ion produces a dibromo compound as product.

Related Questions

Navigate

• Browse (All)
• Browse P
• Subjects

---

---

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