Which of the following formulas represents a saturated cyclic compound?

Which isomer of hexane gives only two monochlorinated products?

The octane number of $2, 2, 3-$trimethylbutane is considered to be ............ .

When ethyl bromide and $n$-propyl bromide are allowed to react with $Na$ metal in dry ether,the number of different alkanes formed is

What effect does branching of an alkane chain have on its boiling point?

Why are alkanes known as "Paraffins"?