NEET 2024, Chemistry Q26: Mechanism of Some Important Reactions of Alkenes

NEET2024Chemistry

Identify the correct reagents that would bring about the following transformation:

A
(i) BH $_{3}$ (ii) H $_{2}$ O $_{2}$ /OH $^{-}$ (iii) alk. KMnO $_{4}$ (iv) H $_{3}$ O $^{+}$
B
(i) H $_{2}$ O/H $^{+}$ (ii) PCC
C
(i) H $_{2}$ O/H $^{+}$ (ii) CrO $_{3}$
D
(i) BH $_{3}$ (ii) H $_{2}$ O $_{2}$ /OH $^{-}$ (iii) PCC

Solution

To place the OH at the terminal carbon (anti-Markovnikov), use hydroboration-oxidation: BH $_{3}$ then H $_{2}$ O $_{2}$ /OH $^{-}$ . The resulting primary alcohol is then oxidised to the aldehyde with PCC (mild oxidant that stops at -CHO).

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NEET 2024, Chemistry Q26: Mechanism of Some Important Reactions of Alkenes

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