Chlorous acid, structure

Isocyanurates hydrolyze to release chlorine and produce hypo-chlorous acid, as shown in the equation that follows the structures of... 

Chlorous acid, HCIO2, is the only known halous acid. All the halogens except fluorine form halic and perhalic acids. The Lewis structures of the chlorine oxoacids are... 

Like HOCl, chlorous acid, HCIO2, is not isolable but is known in aqueous solution and is prepared by reaction 16.62 it is weak acid (pX = 2.0). Sodium chlorite (used as a bleach) is made by reaction 16.63 the chlorite ion has the bent structure 16.32. 

Another inexpensive method for oxidizing an aldehyde to a carboxylic acid is the Pinnick oxidation. This reaction uses sodium chlorite (NaC102) with a phosphate buffer (NaHjPO ) to create chlorous acid, along with a structure to scavenge the hy-pochlorous acid (HOCl) by-product (see the Mechanism box below). While many scavengers are used, the most common is 2-methyl-2-butene. This is a very selective procedure. It will not oxidize alcohols, so they do not have to be protected. 

Lewis structures of the oxoacids of chlorine. The oxidation number of the Cl atom is shown in parentheses. For simplicity, the formal charges have been omitted. Note that although hypo-chlorous acid is written as HCIO, the H atom is bonded to the O atom. 

Write Lewis structures for chlorous acid, HClOj, with and without C1=0 double bonds. Assign formal charges in your stmctures. From the point of view of formal charges, what are the advantages and disadvantages of postulating double bonds ... 

Chlorous acid, HCIO2, has four repulsion axes, two of which are non-bonded pairs it therefore adopts a bent shape. Chloric acid, HCIO3, has four repulsion axes, of which one is a non-bonded pair its shape is pyramidal. Perchloric acid, HCIO4, has four repulsion axes, with no non-bonded pairs, and so we expect a structure based on the tetrahedral shape. 

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