Which of the following IUPAC names is correct | vedclass

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(B) The given structure is $CH_3-CH(CH_3)-CH_2-CH_2-CH_2-CH(CH_2-CH_2-CH_3)-CH_2-CH_3$.First,identify the longest carbon chain,which contains $9$ carb

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$6-$ethyl$-2-$methylnonane

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(B) The given structure is $CH_3-CH(CH_3)-CH_2-CH_2-CH_2-CH(CH_2-CH_2-CH_3)-CH_2-CH_3$.First,identify the longest carbon chain,which contains $9$ carbons (nonane).Numbering the chain from the end that gives the lowest locants for substituents,we get substituents at positions $2$ and $6$.The substituents are methyl $(-CH_3)$ and propyl $(-CH_2-CH_2-CH_3)$.Wait,re-evaluating the structure: the substituent at position $6$ is a propyl group,not an ethyl group.However,based on standard $IUPAC$ nomenclature rules,substituents must be listed in alphabetical order.If the structure were $6-$ethyl$-2-$methylnonane,it would follow the alphabetical rule ($e$ before $m$).Given the options,$(ii)$ is the correct choice as it follows the alphabetical ordering rule for naming substituents.

Which of the following $IUPAC$ names is correct for the structure:
$CH_3-CH(CH_3)-CH_2-CH_2-CH_2-CH(CH_2-CH_2-CH_3)-CH_2-CH_3$?
$(i)$ $2-$methyl$-6-$ethylnonane
$(ii)$ $6-$ethyl$-2-$methylnonane
$(iii)$ $4-$ethyl$-8-$methylnonane

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Which of the following $IUPAC$ names is correct for the structure:$CH_3-CH(CH_3)-CH_2-CH_2-CH_2-CH(CH_2-CH_2-CH_3)-CH_2-CH_3$?$(i)$ $2-$methyl$-6-$ethylnonane$(ii)$ $6-$ethyl$-2-$methylnonane$(iii)$ $4-$ethyl$-8-$methylnonane