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The final product A, formed in the following reaction sequence is Ph — CH=CH2 (i) BH3 (ii) H2O2, OH (iii) HBr (iv) Mg, ether, then HCHO/H3O+

1. Ph — CH2 — CH2 — CH3
2. Ph — CH — CH3 | CH3
3. Ph — CH2 — CH2 — CH2 — OH
4. Ph — CH — CH3 | CH2OH

Correct answer: Ph — CH2 — CH2 — CH2 — OH

Solution

The correct option is Ph — CH2 — CH2 — CH2 — OH because the reaction sequence involves hydroboration-oxidation followed by a Grignard reaction with formaldehyde, leading to the formation of a primary alcohol with a three-carbon chain attached to the phenyl group.

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