Question: Which reagent converts propene to 1-propanol? (A) \[{{H}_{2}}O,{{H}_{2}}S{{O}_{4}}\] (B) \[{{B}_...

Question

Which reagent converts propene to 1-propanol?
(A) ${{H}_{2}}O,{{H}_{2}}S{{O}_{4}}$
(B) ${{B}_{2}}{{H}_{6}},{{H}_{2}}{{O}_{2}},OH$
(C) $Hg{{(OAc)}_{2}},NaB{{H}_{4}}/{{H}_{2}}O$
(D) $Aq. KOH$

Answer 1

Solution

The structure of propene is as follows.

The structure of 1-Propanol is as follows.

In the structure of 1-propanol, the alcohol group is present on the terminal carbon atom.
Normal reagents react with propene and form 2-propanol as the product.
We need selective chemicals to get 1-propanol from propene.

Complete step by step solution:
-In the question, it is asked which chemical is going to convert propene into 1-propanol.
-Coming to given option, option A ${{H}_{2}}O,{{H}_{2}}S{{O}_{4}}$ .
-The reaction of propene with ${{H}_{2}}O,{{H}_{2}}S{{O}_{4}}$ is as follows.

-Propene reacts with ${{H}_{2}}O,{{H}_{2}}S{{O}_{4}}$ and forms a product called 2-propanol. So, Option A is wrong.
-Coming to option B, ${{B}_{2}}{{H}_{6}},{{H}_{2}}{{O}_{2}},OH$ .
- The reaction of propene with ${{B}_{2}}{{H}_{6}},{{H}_{2}}{{O}_{2}},OH$ is as follows.

- Propene reacts with ${{B}_{2}}{{H}_{6}},{{H}_{2}}{{O}_{2}},OH$ and forms 1-propanol as a product. Therefore option B is correct.
-Coming to option C, $Hg{{(OAc)}_{2}},NaB{{H}_{4}}/{{H}_{2}}O$
-The reaction of propene with $Hg{{(OAc)}_{2}},NaB{{H}_{4}}/{{H}_{2}}O$ is as follows.

- Propene reacts with $Hg{{(OAc)}_{2}},NaB{{H}_{4}}/{{H}_{2}}O$ and forms a product called 2-propanol. So, Option C is wrong.
- Coming to option D, Aq. KOH.
- The reaction of propene with Aq. KOH is as follows.

- Propene reacts with Aq. KOH and forms a product called 2-propanol. So, Option D is also wrong.
-Therefore reagent ${{B}_{2}}{{H}_{6}},{{H}_{2}}{{O}_{2}},OH$ converts propene to 1-propanol.

So, the correct option is B.

Note: The reaction of propene with ${{B}_{2}}{{H}_{6}},{{H}_{2}}{{O}_{2}},OH$ gives 1-propanol as the product. This reaction is called hydroboration. Hydroboration gives terminal alcohols as the product when reacts with an alkene. Hydroboration is a selective reaction to prepare terminal alcohols from alkenes.