Examkin

Soru

Zorluk: OrtaAlkanoic Acids, Esterification, Saponification, Fats, and Oils

An organic compound XX with the molecular formula C4H8O2\text{C}_4\text{H}_8\text{O}_2 reacts with aqueous sodium hydroxide upon heating to yield ethanol and a salt YY. What is the IUPAC name of compound YY?

  1. Sodium ethanoateCevap
  2. B
    Ethanoic acid
  3. C
    Sodium propanoate
  4. D
    Sodium methanoate

Cevap

Sodium ethanoate
Alkaline hydrolysis of the four-carbon ester ethyl ethanoate (CH3COOCH2CH3\text{CH}_3\text{COOCH}_2\text{CH}_3) with sodium hydroxide breaks the ester linkage to produce ethanol (C2H5OH\text{C}_2\text{H}_5\text{OH}) and the sodium salt of ethanoic acid, which is sodium ethanoate (CH3COONa\text{CH}_3\text{COONa}).

Adım Adım Çözüm

1
Identify the structure of the ester from its molecular formula and hydrolysis alcohol product.
The ester has molecular formula C4H8O2\text{C}_4\text{H}_8\text{O}_2 and produces ethanol (C2H5OH\text{C}_2\text{H}_5\text{OH}). The alkyl group attached to oxygen contains 2 carbons, leaving 2 carbons for the acyl group. Thus, the ester is ethyl ethanoate (CH3COOCH2CH3\text{CH}_3\text{COOCH}_2\text{CH}_3).
Esters have the general formula RCOOR′\text{RCOOR}', where R′OH\text{R}'\text{OH} is the alcohol component.
2
Determine the products of alkaline hydrolysis.
Heating ethyl ethanoate with aqueous sodium hydroxide (NaOH\text{NaOH}) cleaves the ester link to yield ethanol and sodium ethanoate (CH3COONa\text{CH}_3\text{COONa}).
Alkaline hydrolysis (saponification) yields the alcohol and the alkali metal salt of the alkanoic acid.

Anahtar Kavram

Alkaline Hydrolysis (Saponification) of Esters
Bu soruyu puanla

Konular

Alkanoic Acids, Esterification, Saponification, Fats, and Oils

Bu konudan daha fazla soru