The compound with molecular formula C\(_6\)H\(_6\), which gives only one monobromo derivative and takes up four moles of hydrogen per mole for complete hydrogenation has ___ \(\pi\) electrons.
Designate whether each of the following compounds is aromatic or not aromatic.

Conc. HNO\(_3\)
Which of the following is an octal number equal to decimal number \((896)_{10}\)?