Match List I with List II
|
List I (Oxoacids of phosphorus) |
List II (Characteristic Bonds) |
| (A) \(H_3PO_2\) | (I) 7 |
| (B) \(H_4P_2O_5\) | (II) 12 |
| (C) \(H_4P_2O_6\) | (III) 4 |
| (D) \((HPO_3)_3\) | (IV) 6 |
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 1
The correct answer is option 1. A-III, B-IV, C-I, D-II
|
List I (Oxoacids of phosphorus) |
List II (Characteristic Bonds) |
| (A) \(H_3PO_2\) | (III) 4 |
| (B) \(H_4P_2O_5\) | (IV) 6 |
| (C) \(H_4P_2O_6\) | (I) 7 |
| (D) \((HPO_3)_3\) | (II) 12 |
Let us go through the structure and bonding of each oxoacid of phosphorus in detail to understand the correct matching of bonds.
(A) \( H_3PO_2 \) (Hypophosphorous Acid)
The molecular structure of \( H_3PO_2 \) can be represented as:
Bond Analysis:
P-H bonds: There are 2 P-H bonds (directly attached to phosphorus).
P-OH bond: There is 1 P-OH bond.
P=O bond: There is 1 P=O double bond.
Total number of bonds: Adding these up, the total number of characteristic bonds in \( H_3PO_2 \) is:
\(2 (\text{P-H}) + 1 (\text{P-OH}) + 1 (\text{P=O}) = 4 \text{ bonds}\)
Match: \( H_3PO_2 \) → 4 bonds (III)
(B) \( H_4P_2O_5 \) (Pyrophosphorous Acid)
The molecular structure of \( H_4P_2O_5 \) is:
Bond Analysis:
P-H bonds: There are 2 P-H bonds in this molecule.
P-OH bonds: There are 2 P-OH bonds.
P=O bonds: There are 2 P=O double bonds.
Total number of bonds: Adding these up, the total number of characteristic bonds in \( H_4P_2O_5 \) is:
\(2 (\text{P-OH}) + 2 (\text{P=O}) + 2 (\text{P-H}) = 6 \text{ bonds}\)
Match: \( H_4P_2O_5 \) → 6 bonds (IV).
(C) \( H_4P_2O_6 \) (Hypophosphoric Acid)
The molecular structure of \( H_4P_2O_6 \) is:
Bond Analysis:
P-H bonds: There are no P-H bonds in this molecule.
P-OH bonds: There are 4 P-OH bonds.
P=O bonds: There are 2 P=O double bonds.
P-O-P bond: There is 1 P-O-P bond.
Total number of bonds: Adding these up, the total number of characteristic bonds in \( H_4P_2O_6 \) is
\(4 (\text{P-OH}) + 2 (\text{P=O}) + 1 (\text{P-O-P}) = 7 \text{ bonds}\)
Match: \( H_4P_2O_6 \) → 7 bonds (I).
(D) \( (HPO_3)_3 \) (Metaphosphoric Acid)
\( (HPO_3)_3 \) is a cyclic trimer, with the structure:
Bond Analysis:
P-H bonds: There are no P-H bonds.
P-OH bonds: There are 3 P-OH bonds (one in each \( HPO_3 \) unit).
P=O bonds: There are 3 P=O double bonds (one in each \( HPO_3 \) unit).
O-H bonds : There are three O-H bonds
OThere are 3 P-O-P bonds linking the phosphorus atoms in the cyclic structure.
Total number of bonds: Adding these up, the total number of characteristic bonds in \( (HPO_3)_3 \) is:
\(3 (\text{P-OH}) + 3 (\text{P=O}) + 3 (\text{P-O-P}) + 3 (\text{O-H})= 12 \text{ bonds}\)
Match: \( (HPO_3)_3 \) → 12 bonds (II).
This corresponds to Option 1: A-III, B-IV, C-I, D-II.