In a molecule of pyrophosphoric acid, the number of $\mathrm{P}-\mathrm{OH}, \mathrm{P}=\mathrm{O}$ and $\mathrm{P}-\mathrm{O}-\mathrm{P}$ bonds/ moiety(ies) respectively are

JEE Main · 2020 · 03 Sep 2020 · Shift 1 · p-Block Elements

In a molecule of pyrophosphoric acid, the number of

P - OH, P = O

and

P - O - P

bonds/ moiety(ies) respectively are

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

Answer: (A)

Solution

Pyrophosphoric acid,

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

, is two tetrahedral phosphorus units joined through a single bridging oxygen. Each phosphorus bears one

P = O

and two

P - OH

groups, and the two are linked by one

P - O - P

bridge, giving four

P - OH

, two

P = O

and one

P - O - P

in the molecule.

JEE Main · 2020 · 03 Sep 2020 · Shift 1 · Single correct option

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