The Question is from neet-chemistry organic-chemistry-basics nomenclature, and it was created by the author Mr. S M HUSSAIN

Question

Which of the following is the correct IUPAC name for the compound with the formula $CH_3CH(CH_3)CH_2C(C_2H_5)_2CH_3$?

Mr. S M HUSSAIN · Accepted Answer

## CORE INFORMATION
✓ **Answer**: B
## CONCEPT FRAMEWORK
 **Primary Concept**: IUPAC nomenclature of alkanes
 **Related Topics**: Alkyl groups, branched alkanes, longest carbon chain identification
 **Prerequisites**: Understanding of basic organic chemistry, knowledge of alkyl group names (methyl, ethyl, etc.)
## SOLUTION PATHWAY
**Given Information**:
  Formula: $CH_3CH(CH_3)CH_2C(C_2H_5)_2CH_3$
  Important conditions:  Need to find the longest carbon chain and name substituents correctly.
**Method & Steps**:
 1. Identify the longest continuous carbon chain.
  Reasoning: The longest chain contains six carbon atoms.
  Formula/Rule: The parent alkane is hexane.
 2. Number the carbon atoms in the longest chain, starting from the end closest to the first substituent.
  Working: Numbering from left to right gives the substituents at positions 2, 3, and 4. Numbering from right to left gives substituents at positions 3, 4, and 5. The numbering from left to right gives lower numbers for the substituents.
  Key Point: The goal is to assign the lowest possible numbers to the substituents.
 3. Name the substituents and their positions.  Then arrange the substituents alphabetically.
  Result: There are two methyl groups at positions 2 and 4, and one ethyl group at position 3.
  Verification: Check if the name reflects the structure correctly. The longest chain is hexane, with methyl groups at C2 and C4, and an ethyl group at C3. 
 ## OPTION ANALYSIS
A :x: 2,4-Dimethyl-3-ethylhexane: Correct substituents but incorrect order (alphabetical order is ethyl then methyl).
B ✓: 3-Ethyl-2,4-dimethylhexane: Correct substituents and correct alphabetical order.
C :x: 2,3-Diethyl-4-methylpentane: Incorrect parent chain (pentane instead of hexane).
D :x: 3,3-Diethyl-2-methylpentane: Incorrect parent chain (pentane instead of hexane) and incorrect positions of substituents.
 ## LEARNING AIDS
 **Common Mistakes**:
  1.Incorrectly identifying the longest carbon chain: Carefully examine the structure to find the longest continuous chain of carbon atoms.
  2.Incorrect numbering of the carbon chain:  Always number the chain to give the lowest possible numbers to the substituents.
 **Quick Tips**:
  1.Draw the skeletal structure of the molecule to visualize the carbon chain and substituents more easily.
  2.Use a systematic approach to name the compound, following IUPAC rules step-by-step.

Mr. S M HUSSAIN · Answer

2,4-Dimethyl-3-ethylhexane

Mr. S M HUSSAIN · Answer

The correct Option is "3-Ethyl-2,4-dimethylhexane"

Mr. S M HUSSAIN · Answer

2,3-Diethyl-4-methylpentane

Mr. S M HUSSAIN · Answer

3,3-Diethyl-2-methylpentane

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