Which of the following statement is correct regarding the nitric oxide?
(i) It is reduced to hydroxylamine by `SnCl_(2)`
(ii) It is reduced to `N_(2)O`by `SO_(2)`
(iii) It plays an important role in respiration by controlling blood pressure.
(iv) `No` is produced in the brain as messenger molecule of neurons.

Options

A. (i),(ii),(iii)
B. (i),(iv)
C. (ii),(iii)
D. (i),(ii),(iii),(iv)

Answer

4

Explanation

Stannous chlordie reduces nitric oxide to hydroxylamine
`{:([SnCl_(2)+2HCl rarr SnCl_(4)+2H]xx3),(2NO+6H rarr 2NH_(4)OH),(bar(3SnCl_(2)+6HCl+2NO rarr 3SnCl_(4)+2NH_(2)OH)):}`
`NO` acts as an oxidizing agent ,it oxidizes `SO_(2)` to `H_(2)SO_(4)` and `H_(2)S` to `S`:
`SO_(2)+2NO+H_(2)OrarrH_(2)SO_(4)+N_(2)O`
`H_(2)S2NOrarrH_(2)O+S+N_(2)O`
The little molecules `(NO)` plays a vital role in our bodies and those of all mammals. in fact ,the prestigious journal science called it the `1992`Molecules of the year .It has been known since`1867`that organic nitro compounds such as nitroglycerine ,can relieve angina ,lower blood pressur and relax smooth muscle tissue. Yet it wasnot until `1987` that scientist identified the crucial factor in blood vessel dilation as NO gas .that is ,organic nitro compound were broken down to produce this gas in the organ.
Since this initial work we have come to realize that `NO` is crucial in controlling blood pressure. There is even an enzyme (nitric oxide synthase)whose sole task is the production of `NO`
At this point ,a tremendous quantity of biochemical research is concerned with the rolw of this molecule in the body. A lake of `NO` is implicated as a cause of high blood pressure, whereas septic cause,a leading cause of death in intensive care wards,is ascribed to excess of `NO`
.The gas appears to have a function in memory and in the stomach. Male erections have been proved to depend on production of `NO` and there are claims of important roles for `NO` in females uterine contractions.
One question stil to be answered cocerns the life span of these molecules ,considering the ease with which they react with `O_(2)`