The IUPAC name of the compound CH2=CH-CH(CH3)2 is (a) 1,1 -dimethyl -2-propene (b) 3-methyl-1-bu

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The IUPAC name of the compound CH2=CH-CH(CH3)2 is (a) 1,1...

The IUPAC name of the compound
$\mathrm{CH}_{2}=\mathrm{CH}-\mathrm{CH}\left(\mathrm{CH}_{3}\right)_{2}$ is
(a) 1,1 -dimethyl $-2$-propene
(b) 3-methyl-1-butene
(c) 2-vinylpropane
(d) 1-isopropylethylene

Key Concepts

IUPAC Nomenclature of Alkenes

IUPAC nomenclature provides systematic rules for naming organic compounds, ensuring that each compound has a unique and unambiguous name. For alkenes, the name is derived from the longest continuous carbon chain containing the carbon–carbon double bond. The numbering of the carbon chain is done such that the double bond receives the lowest possible locant, and thereafter the substituents are assigned numbers based on their positions along the chain.

Longest Chain Selection

The process of selecting the longest carbon chain is crucial in organic nomenclature. When a compound contains functional groups, such as a double bond, the chosen chain must include these groups and be as long as possible. This ensures that the main features of the molecule are reflected in the parent name, while additional branches or substituents are noted separately.

Substituent Identification and Numbering

Substituents are groups attached to the parent chain and must be identified and correctly numbered to reflect their positions. In the context of alkenes, once the longest chain containing the double bond is chosen and numbered to give the double bond the lowest possible number, any alkyl or other groups attached to the chain are then numbered accordingly. Correct numbering ensures minimal locants and clear structural representation.

Double Bond Priority in Numbering

In compounds containing a double bond, the functional group takes precedence in the numbering order. The numbering starts from the end closest to the double bond to assign it the lowest possible number. This priority rule helps avoid ambiguity and is a key characteristic of the IUPAC naming system for unsaturated organic compounds.

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