Chapter 12, Problem 41PP

Interpretation Introduction

Interpretation:

Synthesis of 2-methyl-2-pentanol from 2-propanol of the given reaction should be explained.

Concept introduction:

Dehydration reaction:

Removal of water molecule from the reaction when the alcohol is treated with strong acid like sulfuric acid.

  

Alcohol is reaction with concentrated sulfuric acid, first alcohol gets protonated forms carbocation (more stable carbocation) followed by elimination of proton (${\text{H}}^{\text{+}}$) yields alkene as a product. The stability of carbocation is given below,

Tertiary carbocation is more stable than the secondary, secondary carbocation is more stable than primary.

In dehydration reaction, sulfuric acid is act as a proton donor, and which is used to protonate the alcohol and makes carbocation therefore sulfuric acid is the driving force of the reaction. Dehydration reaction will not go without acid (sulfuric acid).

The Grignard reaction:

Alkyl, vinyl, or aryl-magnesium halides ($\text{RMgX}$) is called as Grignard reagent.

Grignard reagent is reaction with carbonyl compound such as aldehyde or ketone, produces corresponding alcohol is the product and it is the one of the carbon – carbon bond forming reaction.

    

Oxidation reaction:

Alcohol undergoes oxidation reaction using oxidising agent like ${\text{KMnO}}_{\text{4}}{\text{or K}}_{\text{2}}{\text{Cr}}_{\text{2}}{\text{O}}_{\text{7}}$ which yields the corresponding carbonyl compounds. Primary alcohol undergoes oxidation reaction yields the corresponding aldehyde or acid, secondary alcohol undergoes oxidation reaction yields the corresponding ketone as the product. Tertiary alcohols do not undergo oxidation reaction.