Target Exam

CUET

Subject

Chemistry

Chapter

Organic: Alcohols, Phenols and Ethers

Question:

Identify the product 'C' in the following sequence of reactions:

Options:

$CH_3-CH_2-CH_2-OH$

Correct Answer:

Explanation:

The correct answer is Option (2)

To identify the product 'C' in the given reaction sequence involving propan-2-ol, let us break down each step in detail.

Step 1: Reaction of propan-2-ol with Cu at high temperature

The first reaction involves propan-2-ol reacting with copper (Cu) at high temperature (573 K). This process is known as dehydrogenation, which leads to the formation of propan-2-one. The balanced reaction is as follows:

Step 2: Reaction of propan-2-one with Grignard reagent \( \text{CH}_3\text{MgBr} \)

In the second step,propan-2-one (A) reacts with methylmagnesium bromide. This is an example of a nucleophilic addition reaction where the Grignard reagent attacks the double bond of the alkene. The resulting product will be an alkyl magnesium halide (an intermediate) which can be represented as:

Step 3: Hydrolysis of the alkyl magnesium halide (B)

In the final step, the intermediate B is treated with dilute acid (H₃O⁺), which leads to the hydrolysis of the alkyl magnesium halide. This reaction will yield a tertiary alcohol:

Thus, the product C in the sequence of reactions is 2-Methylpropan-2-ol.