Question

Iodoform is formed on warming iodine and sodium hydroxide with:
A)$C{H_3}OH$
B) ${C_2}{H_5}OH$
C)$HCOOH$
D) ${C_2}{H_6}$

Answer 1

Hint: We know that Iodoform is otherwise called triiodomethane and, erroneously, as carbon triiodide is the organoiodine compound with the formula \[CH{I_3}\]. A light yellow, glasslike, unpredictable substance, it has an entering and particular scent (in more seasoned science messages, the smell is in some cases alluded to as that of clinics, where the compound is still regularly utilized) and, comparable to chloroform, sweetish taste. It is at times utilized as a sanitizer.

Complete answer:
At the point when Iodine and sodium hydroxide are added to a compound that contains either a methyl ketone or an auxiliary liquor with a methyl group in the alpha position, a light yellow hasten of iodoform or triiodomethane is framed. It very well may be utilized to recognize aldehydes or ketones. In the event that an aldehyde gives a positive iodoform test, it should be acetaldehyde since it is the solitary aldehyde with a \[C{H_3}C = O\] group.
The reaction is,
${C_2}{H_5}OH + 4{I_2} + 6NaOH\xrightarrow{\Delta }CH{I_3} + HCOONa + 5NaI + 5{H_2}O$

Hence option B is correct.

Additional information:
The response of iodine, a base and a methyl ketone gives a yellow acceleration alongside an "disinfectant" smell. It additionally tests positive for a couple of explicit optional alcohols that contain in any event one methyl group in the alpha position.

Note:
We have to remember that the compound discovers limited scope use as a disinfectant. Around the start of the twentieth century, it was utilized in medication as a recuperating and germ-free dressing for wounds and bruises, albeit this utilization is presently supplanted by prevalent germicides. It is the dynamic fixing in numerous ear powders for canines and felines, alongside zinc oxide and propionic corrosive, which are utilized to forestall contamination and work with expulsion of ear hair.