Question

The steps involved in the conversion of propan -$2$-ol to propan -$1$-ol are in the order

• A. Dehydration, addition of HBr, heating with a KOH
• B. Heating with $PCl_5$, heating with alc. KOH, acid catalysed addition of water
• C. Heating with $PCl_5$, heating with alc. KOH, hydroboration oxidation
• D. Dehydration, addition of HBr in presence of peroxide, heating with alc. KOH

Answer 1

The Correct Option is C

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Answer 2

The conversion of propan-2-ol to propan-1-ol involves the following steps:

1. Heating with PCl₅ When propan-2-ol is heated with PCl₅, it undergoes substitution to form propene (\( C_3H_6 \)) by elimination of HCl.
2. Heating with alcohol KOH Heating with alcoholic KOH leads to the formation of propene through elimination (dehydration) by an E2 mechanism.
3. Acid-catalyzed addition of water The final step involves the acid-catalyzed addition of water to the propene, which results in the formation of propan-1-ol.

Thus, the correct sequence of reactions to convert propan-2-ol to propan-1-ol is (C), heating with PCl₅, followed by heating with alcoholic KOH, and then acid-catalyzed addition of water. 

Answer 3

To convert propan-2-ol (secondary alcohol) to propan-1-ol (primary alcohol), the following steps are involved:

1. Heating with PCl$_5$: The alcohol (propan-2-ol) undergoes chlorination with PCl$_5$, forming the corresponding alkyl chloride (propan-2-chloride).
2. Heating with alcoholic KOH: The alkyl chloride undergoes elimination (dehydrohalogenation) in the presence of alcoholic KOH, leading to the formation of propene (an alkene).
3. Acid-catalyzed addition of water: The alkene (propen) undergoes hydration (addition of water) in the presence of an acid catalyst, converting it into propan-1-ol.

Thus, the correct sequence of steps is heating with PCl$_5$, heating with alcoholic KOH, and acid-catalyzed addition of water.

Thus, the correct answer is option (C).