[问答题]
1.Determine the missing name and structure28ytdtkp5.0nhgn g z ( using IUPAC naming rules91d bvaa 3qhwlnzc9 5:n0a6kr.
IUPAC Name Structural formula 2,3-dimethylbutane
2.Determine whether the following molecules are primary, secondary or tertiary halogenoalkanes.
Molecule Primary, secondary or tertiary $CH_3CHClCH_2CH_3$
2-bromo-2-methylbutane