The purine hetrocycle occurs mainly in the structure of DNA. Identify number of 'N' atoms having localised lone pair of electron .

The purine heterocycle occurs mainly in the structure of DNA. Identify number of 'N, atoms having localised lone pair of electron.

A compound having one lone pair of electrons :

The purine heterocycle occurs commonly in the structure of DNA. (a) How is each N atom hydridized? (b) In what type of orbital does each lone pair on a N atom reside? (c) How many pi electrons does purine contain? Why is purine aromatic?

In which , central atom s has have one lone pair of electron ?

In NO_3^- ion, the number of bond pair and lone pair of electrons no N-atom are :

In NO_3^- ion, the number of bond pair and lone pair of electrons no N-atom are :

Which of the following does not have a lone pair of electrons