Given the following mechanism: Step 1: 2-iodo-2-methylpropane à 2-methylpropane

Question

Given the following mechanism:

Step 1:           2-iodo-2-methylpropane                     à        2-methylpropane cation + iodide

Step 2:             2-methylpropyl cation + water            à        protonated 2-methylpropanol

Step 3:             protonated 2-methylpropanol + water à       2-methylpropanol + hydronium

19. Which compound is an intermediate?

                        a. iodide

                        b. protonated 2-methylpropanol

                        c. water

                        d. hydronium

20. Which compound is a reactant?

                        a. iodide

                        b. protonated 2-methylpropanol

                        c. water

                        d. hydronium

Explanation / Answer

ANSWER

19. Option (C) is correct answer.  Protonated 2-methylpropanol is an intermediate in the reaction. Note the carbocation 2-methylpropane cation is also an intermediate. But it was not given as an option.

20.  2-iodo-2-methylpropane and iodide are the two reactants of the reaction. Hence OPTION (a) is CORRECT ANSWER.

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