MCQ
A compound with a molecular formula of $\mathrm{C}_6 \mathrm{H}_{14}$ has two tertiary carbons. Its $IUPAC$ name is :
- A$2-$ methylpentane
- ✓$2,3-$ dimethylbutane
- C$2,2-$ dimethylbutane
- D$n-$hexane

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$(I)$ $Be$ has smaller atomic radius compared to $Mg$
$(II)$ $Be$ has higher ionization enthalpy than $Al.$
$(III)$ Charge/radius ratio of $Be$ is greater than that of $Al$.
$(IV)$ Both Be and $Al$ form mainly covalent compounds.