What would be the reactant and reagent used to obtain 2, 4-dimethyl pentan-3-ol

Question. What would be the reactant and reagent used to obtain 2, 4-dimethyl pentan-3-ol
(a) Propanal and propyl magnesium bromide
(b) 3-methylbutanal and 2-methyl magnesium iodide
(c) 2-dimethylpropanone and methyl magnesium iodide
(d) 2- methylpropanal and isopropyl magnesium iodide

Answer: (d) 2- methylpropanal and isopropyl magnesium iodide

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