What is the IUPAC name of the organic compound formed in the following chemical reaction?
$$\text{Acetone}\underset{(ii){\text{H}}_2{\text{O, H}}^{+}}{\overset{(i){\text{C}}_2{\text{H}}_5\text{MgBr, dry Ether}}{\to }}\text{Product}$$

1. Acetone is Propan-2-one (${\text{CH}}_3-\text{CO}-{\text{CH}}_3$).2. Reaction with ${\text{C}}_2{\text{H}}_5\text{MgBr}$ (Ethyl Magnesium Bromide):The ethyl group (${\text{CH}}_3{\text{CH}}_2^{-}$) attacks the carbonyl carbon.
$${\text{CH}}_3-\text{C}(\text{OMgBr})({\text{CH}}_2{\text{CH}}_3)-{\text{CH}}_3$$
3. Hydrolysis (${\text{H}}_2\text{O}/{\text{H}}^{+}$):
$${\text{CH}}_3-\text{C}(\text{OH})({\text{CH}}_2{\text{CH}}_3)-{\text{CH}}_3$$
The longest chain containing the $-\text{OH}$ group has $4$ carbons (Butan-2-ol), with a methyl branch at position $2$.IUPAC name: 2-methylbutan-2-ol.