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Science · 2024 · 4 marks
CBSE 2024 · Region 3 · Set 1 · Q37
More than three million carbon compounds have been discovered in the field of chemistry. The diversity of these compounds is due to the capacity of…
More than three million carbon compounds have been discovered in the field of chemistry. The diversity of these compounds is due to the capacity of carbon atoms for bonding with one another as well as with other atoms. Most of the carbon compounds are poor conductors of electricity and have low melting and boiling points.
(a)
Write the molecular formula of first two members of homologous series having functional group -Br.
(b)
Given below are the formulae of some functional groups :
(i)
(ii)
Write the name of these functional groups.
(c)
What would be observed on adding a $\displaystyle 5$% alkaline potassium permanganate drop by drop to some warm ethanol taken in a test tube ? State the role of $\displaystyle \mathrm{KMnO}_{4}$ in the reaction and write the chemical equation for the reaction involved.
OR
(c)
Write the name of the compound formed when ethanol is heated at $\displaystyle 443$ K temperature with excess of conc. $\displaystyle \mathrm{H}_{2} \mathrm{SO}_{4}$. What is the role of conc. $\displaystyle \mathrm{H}_{2} \mathrm{SO}_{4}$ in the reaction ? Write the chemical equation for the reaction involved.
Marking-scheme solution
(a) • \(\displaystyle \mathrm{CH}_{3} \mathrm{Br}\)
\(\displaystyle \mathrm{C}_{2} \mathrm{H}_{5} \mathrm{Br}\)
(b)(i)
Aldehyde
(ii) Ketone
(c)
The colour of \(\displaystyle \mathrm{KMnO}_{4}\) disappears;
\(\displaystyle \mathrm{KMnO}_{4}\) acts as an oxidizing agent.
\(\displaystyle \mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{OH} \xrightarrow{\text { Alkaline } \mathrm{KMnO}_{4}+\text { Heat }} \mathrm{CH}_{3} \mathrm{COOH}\)
OR
(c)
• Ethene Conc. \(\displaystyle \mathrm{H}_{2} \mathrm{SO}_{4}\) acts as a dehydrating agent.
\(\displaystyle \mathrm{C}_{2} \mathrm{H}_{5} \mathrm{OH} \xrightarrow[443 \mathrm{~K}]{\text { Conc. } \mathrm{H}_{2} \mathrm{SO}_{4}+\text { Heat }} \mathrm{CH}_{2}=\mathrm{CH}_{2}+\mathrm{H}_{2} \mathrm{O}\)
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CBSE Class 10 Science past-paper question from the 2024 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.