Question

how many H-atoms are directly bonded to P-atom in a molecule of isohypophosphoric acid (${\mathrm{H}}_4{\mathrm{P}}_2{\mathrm{O}}_6$)?

Answer 1

Isohypophosphoric acid (${\mathrm{H}}_4{\mathrm{P}}_2{\mathrm{O}}_6$):

• The molecular formula representing isohypophosphoric acid is ${\mathrm{H}}_4{\mathrm{P}}_2{\mathrm{O}}_6$.
• The structure for the given molecule can be shown as:

• From this structure, it is indicated that isohypophosphoric acid (${\mathrm{H}}_4{\mathrm{P}}_2{\mathrm{O}}_6$) has 1 P-P bonding, and 6 P-O bonding and there are no hydrogen atoms directly attached to the phosphorous atom, no direct P-H bonding exists between them.

Hence, as there are no direct hydrogen atoms directly attached to the phosphorous atom, therefore, no direct P-H bonding exists between isohypophosphoric acid (${\mathrm{H}}_4{\mathrm{P}}_2{\mathrm{O}}_6$).