To obtain 3-methylbutan-2-ol from acetaldehyde, the Grignard's reagent used is

1. $\mathrm{CH}_3 \mathrm{MgBr}$
2. $\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{CH}_2 \mathrm{MgBr}$
3. $\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{MgBr}$
4. 
   

Asked in: MHT CET 2021 (23 Sep Shift 1)

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