The number of $\mathrm{P}-\mathrm{O}-\mathrm{P}$ bonds in $\mathrm{H}_{4} \mathrm{P}_{2} \mathrm{O}_{7}$, $\left(\mathrm{HPO}_{3}\right)_{3}$ and $\mathrm{P}_{4} \mathrm{O}_{10}$ are respectively.

JEE Main · 2023 · 15 Apr 2023 · Shift 1 · p-Block Elements

The number of

P - O - P

bonds in

H_{4} P_{2} O_{7}

(HPO_{3})_{3}

and

P_{4} O_{10}

are respectively.

(A) $1, 3, 6$ ✓ Correct
(B) $0, 3, 6$
(C) $0, 3, 4$
(D)1, 2, 4

Answer: (A)

Solution

In pyrophosphoric acid,

H_{4} P_{2} O_{7}

, two

P O_{4}

tetrahedra share a single corner oxygen, so the structure carries one

P - O - P

bridge. Cyclic metaphosphoric acid,

(HP O_{3})_{3}

, is a six-membered ring of three phosphorus atoms joined through three bridging oxygens, giving three

P - O - P

linkages. In

P_{4} O_{10}

the four phosphorus atoms occupy the corners of a tetrahedron and are connected by six bridging oxygens along the six edges, giving six

P - O - P

bridges. The numbers of

P - O - P

bonds in the three species are therefore 1, 3 and 6 respectively.

JEE Main · 2023 · 15 Apr 2023 · Shift 1 · Single correct option

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