Class 11Chemistry8-1.Organic Chemistry : Classification and Nomenclature of Organic compoundsNomenclature of organic compounds
MediumGive the $IUPAC$ name of $(CH_3)_3C-CH(C_2H_5)_2$. Why is $3-$methyl$-4,4-$dimethylpentane an incorrect name?
(A) The structure is $(CH_3)_3C-CH(C_2H_5)_2$.
First,identify the longest carbon chain,which contains $6$ carbons (hexane).
Numbering from the left gives substituents at positions $2, 2, 3$.
The correct $IUPAC$ name is $3-$ethyl$-2,2-$dimethylpentane.
The name $3-$methyl$-4,4-$dimethylpentane is incorrect because it does not identify the longest carbon chain correctly and violates the rules for selecting the parent chain and numbering.
First,identify the longest carbon chain,which contains $6$ carbons (hexane).
Numbering from the left gives substituents at positions $2, 2, 3$.
The correct $IUPAC$ name is $3-$ethyl$-2,2-$dimethylpentane.
The name $3-$methyl$-4,4-$dimethylpentane is incorrect because it does not identify the longest carbon chain correctly and violates the rules for selecting the parent chain and numbering.
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