In a cyclotrimetaphosphoric acid molecule, how many single and double bonds are present?
- $3$ double bonds; $9$ single bonds
- $6$ double bonds; $6$ single bonds
- $3$ double bonds; $12$ single bonds
- Zero double bonds; $12$ single bonds
The Correct Option is C
Approach Solution - 1
Approach Solution -2
P=O bonds, as well as P-P or P-H bonds, can be found in polyphosphoric oxoacids. In phosphorus oxoacids, the oxidation number of P is less than +5.
| Name | Formula | The oxidation state of Phosphorous | Characteristics of bonds and their number |
| hypo phosphorous | H3PO2 | +1 | One P-OH,Two P-H,One P=O |
| Ortho phosphorous | H3PO3 | +3 | two P-OH,one P-H,One P=O |
| Pyro phosphoric acid | H3PO4 | +5 | Three P-H,One P=O |
| Metaphosphoric acid | (HPO3)n | +5 | Three p-OH,Three P=O,Three P-O-P |
The molecule of cyclotrimetaphosphoric acid has three P=O bonds, three P-OH links, and three O-P-O bonds, as can be seen from the structure above. Thus, there are 12 single bonds and 3 double bonds overall. Therefore, the molecule of cyclotrimetaphosphoric acid contains 12 single bonds and 3 double bonds.
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Concepts Used:
P-Block Elements
- P block elements are those in which the last electron enters any of the three p-orbitals of their respective shells. Since a p-subshell has three degenerate p-orbitals each of which can accommodate two electrons, therefore in all there are six groups of p-block elements.
- P block elements are shiny and usually a good conductor of electricity and heat as they have a tendency to lose an electron. You will find some amazing properties of elements in a P-block element like gallium. It’s a metal that can melt in the palm of your hand. Silicon is also one of the most important metalloids of the p-block group as it is an important component of glass.
P block elements consist of:
- Group 13 Elements: Boron family
- Group 14 Elements: Carbon family
- Group 15 Elements: Nitrogen family
- Group 16 Elements: Oxygen family
- Group 17 Elements: Fluorine family
- Group 18 Elements: Neon family