What is the name of the organic compound formed in the following chemical reaction ?

The correct answer is 2-methyl butan-2-ol.

Analysis of the Chemical Reaction:

As seen in the provided image:

The chemical reaction involves the reaction of Acetone with ethylmagnesium bromide (${\text{C}}_2{\text{H}}_5\text{MgBr}$), a Grignard reagent, in dry ether, followed by acidic hydrolysis (${\text{H}}_2\text{O},{\text{H}}^{+}$).

Step-by-Step Reaction Mechanism:

Step 1: Nucleophilic Addition of Grignard Reagent
Acetone is a ketone with the formula ${\text{CH}}_3-\text{CO}-{\text{CH}}_3$ (propan-2-one). The ethyl group (${\text{C}}_2{\text{H}}_5^{-}$) of ethylmagnesium bromide acts as a nucleophile and attacks the electrophilic carbonyl carbon atom of acetone, opening the carbon-oxygen double bond to form a magnesium alkoxide complex adduct.

${\text{CH}}_3-\text{CO}-{\text{CH}}_3+{\text{C}}_2{\text{H}}_5\text{MgBr}\to {\left({\text{CH}}_3\right)}_2\text{C}\left({\text{C}}_2{\text{H}}_5\right)-{\text{O}}^{-}{\text{MgBr}}^{+}$

Step 2: Acid Hydrolysis
Protonation of the alkoxide adduct via treatment with dilute acid (${\text{H}}_2\text{O}/{\text{H}}^{+}$) yields a tertiary alcohol:

(CH3)2C(C2H5)-O-MgBr+→H2O/H+CH3-C(OH)(CH3)-CH2-CH3+Mg(OH)Br

IUPAC Naming of the Product:
The resulting alcohol structure is ${\text{CH}}_3-\text{C}\left(\text{OH}\right)\left({\text{CH}}_3\right)-{\text{CH}}_2-{\text{CH}}_3$.
1. The longest continuous carbon chain containing the hydroxyl functional group ($-\text{OH}$) consists of 4 carbon atoms, which makes the parent alkane butane.
2. Numbering the chain from the end closest to the $-\text{OH}$ group gives the carbon carrying the $-\text{OH}$ group position 2.
3. There is a methyl substituent ($-{\text{CH}}_3$) also attached to position 2.
4. Thus, the systematic IUPAC name of the formed organic compound is 2-methyl butan-2-ol.