MCQ
$IUPAC$ name of following compound $(\mathrm{P})$ is


- A$1-$Ethyl$-5,$ $5-$dimethylcyclohexane
- ✓$3-$Ethyl$-1$,$1-$dimethylcyclohexane
- C$1-$Ethyl$-3$, $3-$dimethylcyclohexane
- D$1$,$1-$Dimethyl$-3-$ethylcyclohexane

$3-$ $1,$ dimenthylcyclohexane
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Given : $\Delta H _{ f }^{\ominus}\left( Al _2 O _3\right)=-1700\,kJ\,mol ^{-1}$
$\Delta H _{ f }^\theta\left( Fe _2 O _3\right)=-840\,kJ\,mol ^{-1}$
Molar mass of $Fe , Al$ and $O$ are $56,27$ and $16\,g\,mol ^{-1}$ respectively.
