Select the correct IUPAC names for $ ext{CH}_3 ext{COCH}_3$ and $ ext{C}_2 ext{H}_5 ext{OH}$ compounds, r

Question

Select the correct IUPAC names for $	ext{CH}_3	ext{COCH}_3$ and $	ext{C}_2	ext{H}_5	ext{OH}$ compounds, respectively.

Examoogle · Accepted Answer

The correct answer is Option B: Propanone and ethanol. The chemical formula $CH_{3}COCH_{3}$ represents acetone, which is the simplest ketone, having a three-carbon chain with a carbonyl group at the central carbon, leading to the IUPAC name Propanone. The formula $C_{2}H_{5}OH$ represents ethanol, an alcohol consisting of a two-carbon ethyl group attached to a hydroxyl ($-OH$) functional group.

Step-by-Step Solution & Concepts:
The chemical formula $CH_{3}COCH_{3}$ represents acetone, which is the simplest ketone, having a three-carbon chain with a carbonyl group at the central carbon, leading to the IUPAC name Propanone. The formula $C_{2}H_{5}OH$ represents ethanol, an alcohol consisting of a two-carbon ethyl group attached to a hydroxyl ($-OH$) functional group.

Working Principle: IUPAC nomenclature follows strict rules based on the longest carbon chain and the presence of functional groups. For $CH_{3}COCH_{3}$ (propanone), the suffix '-one' is used for the ketone group. For $C_{2}H_{5}OH$ (ethanol), the suffix '-ol' is used for the alcohol functional group attached to the ethane backbone.

Key Formulas: $CH_{3}COCH_{3}$ — Propanone (Ketone); $C_{2}H_{5}OH$ — Ethanol (Alcohol)

Key Points: Acetone ($CH_{3}COCH_{3}$) belongs to the ketone family and is named Propanone.; Ethanol ($C_{2}H_{5}OH$) belongs to the primary alcohol family and is named Ethanol.; The IUPAC suffix for ketones is '-one' and for alcohols is '-ol'.

Applications: Propanone is used as a common industrial solvent.; Ethanol is used as a fuel, solvent, and in medical disinfectants.

Additional Info: Propanone is also commonly known as Acetone.. Ethanol is also commonly known as Ethyl Alcohol.

Answer: B is correct — $CH_{3}COCH_{3}$ is named Propanone and $C_{2}H_{5}OH$ is named Ethanol according to IUPAC rules.

Exam Tip: Always identify the functional group first when naming organic compounds, then find the longest parent carbon chain to correctly apply the suffix.

Examoogle · Answer

Option A: Propanoic acid and ethanol

Examoogle · Answer

Option C: Propanone and methanol

Examoogle · Answer

Option D: Ethanol and propanone

Feature	Ketone	Alcohol
Compound	CH3COCH3	C2H5OH
Functional Group	Carbonyl (C=O)	Hydroxyl (-OH)

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