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(A, B, C, D) The $IUPAC$ nomenclature rules dictate the following:$(a)$ The prefix $di-$ indicates two identical substituents. Since two methyl groups

Vedclass · Accepted Answer

$2,2-$ Dimethylpentane

Vedclass · Answer

(A, B, C, D) The $IUPAC$ nomenclature rules dictate the following:$(a)$ The prefix $di-$ indicates two identical substituents. Since two methyl groups are at $C-2$,the correct name is $2,2-$ dimethylpentane.$(b)$ According to the lowest locant rule,the set $2,4,7$ is preferred over $2,5,7$. Thus,the correct name is $2,4,7-$ trimethyloctane.$(c)$ When substituents are at equivalent positions,alphabetical priority determines the numbering. $Chloro$ comes before $methyl$,so $2-$ chloro$-4-$methylpentane is correct.$(d)$ The alcohol group $(-OH)$ has higher priority than the alkyne group $(-C \equiv C-)$. The chain is numbered to give the principal functional group the lowest possible number. Thus,the correct name is But$-3-$yn$-1-$ol.

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