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NEET CHEMISTRYAlcohols, Phenols and EthersMedium

Question

Identify the correct reagents that would bring about the following transformation (Alkene →\rightarrow Alcohol):

A

(i) BH3BH_3

B

(i) BH3BH_3 (ii) H2O2/OH−H_2O_2/OH^-

C

(i) PCC (ii) alk. KMnO4KMnO_4

D

(i) H2O/H+H_2O/H^+ (ii) PCC

Step-by-Step Solution

The transformation of an alkene to an alcohol can be achieved via Hydroboration-Oxidation.

  1. Step 1: The alkene reacts with diborane (B2H6B_2H_6 or BH3BH_3) to form a trialkylborane. This is an electrophilic addition reaction.
  2. Step 2: The trialkylborane is oxidised by alkaline hydrogen peroxide (H2O2/OH−H_2O_2/OH^-) to form an alcohol.

This reaction is characterized by the Anti-Markovnikov addition of water (the -OH group attaches to the less substituted carbon atom) and syn-addition (H and OH add to the same side). Reagents like H2O/H+H_2O/H^+ (Acid catalysed hydration) would follow Markovnikov's rule.

Exam Context & Concepts Covered

This question aligns with the NEET CHEMISTRY syllabus, specifically targeting concepts from Alcohols, Phenols and Ethers. Mastering this topic is crucial for scoring well in the upcoming medical entrance examinations. Solving conceptually related problems will help you understand the nuances of these concepts and improve your problem-solving speed.

CHEMISTRYAlcohols, Phenols and Ethersidentifycorrectreagentsfollowingtransformation

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