Question

Show how would you synthesis the following alcohols from appropriate alkenes?

Answer 1

In order to answer the given question, we have to remember that the main chemical reactions which alkenes will be undergoing are the addition reactions. The addition reaction will convert the carbon-carbon double bond of alkenes into the carbon-carbon single bond when some other external functional group is added.

Complete Solution :
Let us first understand the addition reaction. Addition reaction is a chemical reaction which involves the conversion of the carbon-carbon double bond of alkenes into the carbon-carbon single bond when some other external functional group is added.
(I) Now let us move onto the question given. The first alcohol given is 1-Methylcyclohexan-1-ol. It can be prepared from two alkenes namely 1-Methylcyclohexene and Methylenecyclohexene. The addition of water molecules to these two alkenes will give 1-Methylcyclohexan-1-ol. When the water is added the Carbon-carbon double bond present in the alkenes will be converted into carbon-carbon single bond.

(II) The second alcohol given is the 4-Methyl cycloheptane-4-ol. The 4-Methyl cycloheptane-4-ol can be prepared from 4-Methyl hept-3-ene by the addition of water molecules.

(III) The third alcohol given is the pentan-2-ol. It can be obtained from two alkenes namely 1-Pentene and 2-Pentene. Addition of water molecules to these two alkenes will give Pentan-2-ol.

(IV) The fourth alcohol given is 2-Cyclohexyl Butan-2-ol. This alcohol can be prepared by the addition of water molecules to 2-Cyclohexyl But-2-ene.

Note: The other addition reaction which can take place in the alkene molecule are the following:
- Addition of hydrogen
- Addition of Halogen
- Addition of Hydrogen halide