According to Huckl rule, the number of pi electrons in naphthanlene is:

The number of pi - electrons in naphthalene is

According to Huckel rule, the number of i electrons in anthracene is

The number of pi electrons in anthracene is

The number of pi electrons in anthracene is

Number of pi electrons present in naphthalene is :

Number of pi electrons present in naphthalene is

The number of pi -electrons in phenanthracene is :

According to the octet rule, the number of electrons, in the valence shell of central atom of the molecule is___.