Question

An organic compound A is a constituent of wine and beer. The compound on heating with potassium dichromate forms another organic compound B. Identify the compound A. Write the chemical equation for the complete reaction that takes place to form compound B. Name the compound B.

Answer 1

1. The chief constituent of wine and beer and wine is Ethanol,compound A.
2. The molecular formula of Ethanol is ${\mathrm{C}}_2{\mathrm{H}}_5\mathrm{OH}$.
3. Now Ethanol $\left({\mathrm{C}}_2{\mathrm{H}}_5\mathrm{OH}\right)$on heating with Potassium dichromate$\left({\mathrm{K}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7\right)$ to form Acetaldehyde$\left({\mathrm{CH}}_3\mathrm{CHO}\right)$, compound B.
4. The above reaction can be as represented below:

$\underset{\left(\mathrm{Ethanol}\right)}{{\mathrm{C}}_2{\mathrm{H}}_5\mathrm{OH}\left(\mathrm{l}\right)}\underset{{\mathrm{K}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7\left({\mathrm{H}}^{+}\right)}{\overset{\left(\mathrm{O}\right)}{\to }}\underset{\left(\mathrm{Acetaldehyde}\right)}{{\mathrm{CH}}_3\mathrm{CHO}\left(\mathrm{l}\right)}$