Which (if any) of the following statements is incorrect? a. Hg^2+ is required as

Question

Which (if any) of the following statements is incorrect? a. Hg^2+ is required as a catalyst in the hydration of terminal alkynes. b. Hydroboration proceeds via the syn - addition of BH_3 (H-BH_2) across a double bond. c. Carbocation rearrangement is not a concern in an alkene hydroboration reaction or alkene halogenation (reaction with X_2). d. A vinyl carbocation is more stable than a primary carbocation. e. All of the above statements are correct. Which compound shown below will undergo hydrogenation (H_2, Pd/C) at the fastest rate?

Explanation / Answer

8. a. Hg2+ is required as a catalyst in the hydration of terminal alkynes ; Correct

b.Hydroboration proceeds via the syn-addition of BH3(-BH2) across a double bond :Correct

   c. Carbocation rearrangement is not concern in an alkene hydroboration or alkene halogenation

    (reaction with X2)  : Incorrect

   d.A vinyl carbocation is more stable than primary carbocation : Incorrect

   e.All above statements are correct : Incorrect

9. Compound a. methyl acetylene will undergo hydrogenation (H2,Pd/C) at the fastest rate. This is because the molecule is planar & there is no steric hindrance for addition of hydrogen on the face of the substrate methyl acetylene.

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