Question

answer all please

s) to perform the following transformation? 28. What is the best choice of reagent(s) to P C H3C-CH2-CECH CH2, "сн, нс н A) H/Lindlar catalyst B) Na/NH, C) (sia) BH; followed by H202, NaOH D) H20; HgSO4 H2SO4 29. Which of the reaction coordinate diagrams below represents the course of a two-step exothermic reaction? Free energy Free energy Free energy Free energy- Reaction coordinate Reaction coordinate Reaction coordinate Reaction coordinate A) i B) ii C ) iii D) IVE ) none of the diagrams

Answer 1

Question 28. Option C

Explanation:

Step (i). Hydroboration with (sia)2BH gives CH3-CH2-CH=CH-B(sia)2.

Step (ii). The reaction of the hydroboration product with H2O2, NaOH gives CH3-CH2-CH=CH-OH.

Step (iii). The enol tautomerizes to form an aldehyde, i.e. CH3-CH2-CH2-CHO.

Question 29. Option A

Explanation:

During the two-step exothermic reaction, the reactants are in high energy and there will be the formation of two transition states and one intermediate. Finally, the product will have low energy.