High School

Which Grignard reagent and carbonyl compound combination can be used to prepare the alcohol [tex]$CH_3CH_2OH$[/tex]?

A. Grignard reagent: [tex]$CH_3MgBr$[/tex], Carbonyl compound: [tex]$HCHO$[/tex]
B. Grignard reagent: [tex]$C_2H_5MgBr$[/tex], Carbonyl compound: [tex]$CH_3CHO$[/tex]
C. Grignard reagent: [tex]$CH_3CH_2MgBr$[/tex], Carbonyl compound: [tex]$CH_3CHO$[/tex]
D. Grignard reagent: [tex]$CH_3MgBr$[/tex], Carbonyl compound: [tex]$CH_3COCH_3$[/tex]

Answer :

Final answer:

To prepare the ethanol (CH3CH2OH), we can use the Grignard reagent CH3MgBr (methylmagnesium bromide) and the carbonyl compound HCHO (formaldehyde). This is because the Grignard reagent acts as a nucleophile, attacking the carbonyl carbon atom and forming an alcohol once it's protonated.

Explanation:

To prepare the alcohol CH3CH2OH (ethanol), you would use the Grignard reagent CH3MgBr and the carbonyl compound HCHO. The Grignard reagent is a carbon nucleophile that would attack the carbonyl carbon atom, forming an alcohol once it's protonated. Let's break it down:

  1. CH3MgBr reacts with HCHO.
  2. The carbon from CH3MgBr (the Grignard reagent) attacks the carbonyl carbon in HCHO.
  3. After work up (protonation) once the reaction is done, this produces CH3CH2OH (ethanol).

Learn more about Grignard Reagents and Alcohols here:

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