The IUPAC name of the given compound is CH_3- | vedclass

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(C) $1$. The principal functional group is the nitrile group $(-CN)$,so it is assigned the lowest possible number,$C-1$.$2$. The parent carbon chain m

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$3-$ Ethyl $-2-$ methylpent $-4-$ ene $-1-$ nitrile

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(C) $1$. The principal functional group is the nitrile group $(-CN)$,so it is assigned the lowest possible number,$C-1$.$2$. The parent carbon chain must include the $-CN$ carbon and the double bond. The longest chain containing these is a $5$-carbon chain (pentene derivative).$3$. Numbering: $C^1(N) - C^2H(CH_3) - C^3H(CH_2CH_3) - C^4H = C^5H_2$.$4$. Substituents: $A$ methyl group at $C-2$ and an ethyl group at $C-3$.$5$. Alphabetical order: Ethyl comes before Methyl.$6$. The correct $IUPAC$ name is $3-$ Ethyl $-2-$ methylpent $-4-$ ene $-1-$ nitrile.

The $IUPAC$ name of the given compound is $CH_3-CH(CN)-CH(CH=CH_2)-CH_2-CH_3$.

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