Question

When ethanol is converted into ethanoic acid by using acidified potassium dichromate, the ethanol is
A. Reduced and color change from orange to green
B. Reduced and the color change from green to orange
C. Oxidized and color changes from orange to green
D. Oxidized and color changes from green to orange

Answer 1

Hint: Ethyl alcohol or ethanol is often converted to ethanoic acid by the oxidation reaction. Oxidation means the addition of oxygen to the compound or removal of hydrogen or removal of electrons from the compound. Acetic acid is additionally called ethanoic acid.

Complete step by step answer:
Ethanol is a compound and chemical liquid with the formula ${\text{C}}_{\text{2}}{\text{H}}_{\text{5}}\text{OH}$.The $\text{OH}$ within the ethanol is understood because the functional group. It's the functional group that gives the ethanol with its characteristic properties. Ethanol is employed as a solvent within the extraction process. Oxidation of ethanol is often done by treating ethanol with oxidizing agents. The oxidizing agents used for the oxidation of ethyl alcohol are alkaline permanganate of potash or acidic salt. The oxidation of ethanol involves a two-step process. Within the initiative, ethanol goes to convert into acetaldehyde. During this step removal of hydrogen from ethanol goes to happen and produces acetaldehyde as a product.
${\text{C}}_{\text{2}}{\text{H}}_{\text{5}}\text{OH}\stackrel{{\text{K}}_{\text{2}}\text{C}{\text{r}}_{\text{2}}{\text{O}}_{\text{7}}}{\to }\text{C}{\text{H}}_{\text{3}}\text{CHO}$

In the second step acetaldehyde undergoes again oxidation and forms acetic acid or ethanoic acid as a product. within the step addition of oxygen to acetaldehyde goes to happen and produces ethanoic acid as a product.
$\text{C}{\text{H}}_{\text{3}}\text{CHO}\stackrel{{\text{K}}_{\text{2}}\text{C}{\text{r}}_{\text{2}}{\text{O}}_{\text{7}}}{\to }\text{C}{\text{H}}_{\text{3}}\text{COOH}$

We can represent the step process during a single step within the following way.
${\text{C}}_{\text{2}}{\text{H}}_{\text{5}}\text{OH}\stackrel{{\text{K}}_{\text{2}}\text{C}{\text{r}}_{\text{2}}{\text{O}}_{\text{7}}}{\to }\text{C}{\text{H}}_{\text{3}}\text{CHO}$

This reaction takes place in presence of strong oxidizing agents like $${\text{K}}_{\text{2}}\text{C}{\text{r}}_{\text{2}}{\text{O}}_{\text{7}}\text{ + }\left(\text{dil}\text{.}\right){\text{H}}_{\text{2}}\text{S}{\text{O}}_{\text{4}}$$

$${\text{K}}_{\text{2}}\text{C}{\text{r}}_{\text{2}}{\text{O}}_{\text{7}}\text{ + 4}{\text{H}}_{\text{2}}\text{S}{\text{O}}_{\text{4}}\left(\text{dil}\text{.}\right)\to {\text{K}}_{\text{2}}\text{S}{\text{O}}_{\text{4}}\text{ + Cr}{\left(\text{S}{\text{O}}_{\text{4}}\right)}_{\text{3}}\text{ + 4}{\text{H}}_{\text{2}}\text{O + 3}\left[\text{O}\right]$$

This reaction takes place underneath, which provides nascent oxygen. Due to this, color changes from orange to green.

Hence the correct answer is C.

Additional information:
Conversion of ethanol to ethanoic acid occurs when bottles of wine are left open for an extended time thanks to oxidation. Ethanoic acid reacts with metals and forms hydrogen because the product. Ethanoic acid reacts with base and forms salts. Ethanoic acid turns blue paper to red paper.

Note: Excess oxidant is employed to convert ethanol to ethanoic acid , if we minimum amount of oxidizing then ethanol converts into acetaldehyde only. The formation of acetaldehyde during the oxidation of ethanol is often easily identified by the sweet smell of acetaldehyde.