Write down the bond line structure of the following: 

Bicyclo [$3.1.0$] hexane 

Write down the bond line structure of the following: 

8-Chlorobicyclo [4.2.0] oct-2-ene

Write down the bond line structure of the following:

$5$-Bromo-$9$-methyltricyclo [$5.3.0.0^{2.6}$] decane

Identify the bridgehead atoms in the following molecule.

Identify the bridgehead atoms in the following molecule.

Identify the bridgehead atoms in the following molecule.

Identify the bridgehead atoms in the following molecule.

The IUPAC name of the following compound is