General Organic Chemistry Question 41
Question 41 - 2024 (31 Jan Shift 1)
Given below are two statements:
Statement I: IUPAC name of $HO-CH _2-\left(CH _2\right) _3-CH _2-COCH _3$ is 7-hydroxyheptan-2-one.
Statement II: 2-oxoheptan-7-ol is the correct IUPAC name for above compound.
In the light of the above statements. choose the most appropriate answer from the options given below:
(1) Statement I is correct but Statement II is incorrect.
(2) Both Statement I and Statement II are incorrect.
(3) Both Statement I and Statement II are correct.
(4) Statement I is incorrect but Statement II is correct.
Show Answer
Answer (1)
Solution
Formula: 
Structure Analysis:
The compound is a six-carbon chain with a hydroxy group (HO) at one end and a ketone group (COCH3) at the other end. The longest continuous carbon chain, including both functional groups, has seven carbons.
Naming the Compound:
Identify the longest chain: The longest chain has seven carbon atoms, making it a “heptane” derivative. Functional groups: The hydroxy group (−OH) is on the $7^{th}$ carbon. The ketone group $(−COCH_3)$ is on the second carbon. Here, -OH group act as substituent group (Prefix). So, IUPAC name is 7-hydroxyheptan-2-one.
Statement I: “7-hydroxyheptan-2-one”
This name suggests a hydroxy group on the seventh carbon and a ketone on the second carbon. Therefore, Statement I is correct.
Statement II: “2-oxoheptan-7-ol”
This name suggests a ketone (oxo group) on the second carbon and a hydroxy group on the seventh carbon. But, here keto group act as functional group (suffix). So, statement II is incorrect.
BETA
