Question Video: Identifying the Molecular Formula of the Ester That Is Hydrolysed to Produce the Given Products from a Set of Molecular Formulas | Nagwa Question Video: Identifying the Molecular Formula of the Ester That Is Hydrolysed to Produce the Given Products from a Set of Molecular Formulas | Nagwa

Question Video: Identifying the Molecular Formula of the Ester That Is Hydrolysed to Produce the Given Products from a Set of Molecular Formulas Chemistry • Third Year of Secondary School

Consider the following reaction: A ⟶ CH₃COOH + CH₃CH₂CH₂OH. What ester gives the products shown when hydrolyzed?

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Video Transcript

Consider the following reaction: A reacts to form CH3COOH plus CH3CH2CH2OH. What ester gives the products shown when hydrolyzed?

Four condensed formulas are provided. According to the question, reactant A is an ester. Let’s examine the provided equation more closely. We can identify the first product as a carboxylic acid because it contains the carboxyl group or COOH. We can identify the second product as an alcohol because a hydroxy group or OH is bonded to the carbon-based chain. The question also tells us that the ester is being hydrolyzed. This means that the ester is undergoing an ester hydrolysis reaction. During this type of reaction, water reacts with the ester to produce a carboxylic acid and an alcohol.

An ester has the general chemical formula RCOOR prime. Let’s draw an expanded structural formula for an ester. The ester functional group contains one carbon-to-oxygen double bond and one carbon-to-oxygen single bond. R represents an alkyl group or a hydrogen atom, and R prime represents an alkyl group. Our job in solving this problem is to determine the identity of R and R prime. Let’s work backwards from the provided condensed formulas of the products.

Here are the structural formulas of the carboxylic acid and the alcohol. During an ester hydrolysis reaction, the carbon-to-oxygen single bond of the ester group is broken. The RCO portion of the ester is converted into the carboxylic acid. This means that the CH3CO part of the carboxylic acid was the RCO group of the original ester. During the reaction, the OR prime group of the ester is converted into the alcohol. This means that the CH3CH2CH2O part of the alcohol was the OR prime group in the original ester.

Finally, we need to convert the expanded structural formula of the ester into a condensed formula. The condensed formula of the ester that gives the products shown when hydrolyzed is CH3COOCH2CH2CH3, or choice (A).

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