MHTCET 20 Apr 2026 Shift 2 Paper

Concept:IUPAC naming of substituted cyclohexanes follows the lowest locant rule and alphabetical order of substituents.Explanation:The parent ring is $\text{cyclohexane}$.The substituents are one methoxy group $\left(-\mathrm{OCH}_{3}\right)$ and two ethyl groups $\left(-\mathrm{CH}_{2}\mathrm{CH}_{3}\right)$.Number the ring from the carbon bearing the two ethyl groups: locants are $1,1,4$.Number the ring from the carbon bearing the methoxy group: locants are $1,4,4$.Compare $1,1,4$ and $1,4,4$: at the first point of difference, $1<4$, so $1,1,4$ is the lower set.Thus, the carbon with two ethyl groups is $\mathrm{C}1$, and the methoxy group is at $\mathrm{C}4$.Write substituents alphabetically: ethyl before methoxy, and the prefix "di" is not considered for alphabetization.Answer:$1,1$-diethyl-$4$-methoxycyclohexaneOption A.