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Science · 2023 · 5 marks
CBSE 2023 · Region 6 · Set 1 · Q34
(i)A compound 'A' with a molecular formula of $\displaystyle \mathrm{C}_{2} \mathrm{H}_{4} \mathrm{O}_{2}$ reacts with a base to give salt and water. Identify 'A', state its nature and the name of the functional group it possesses. Write chemical equation for the reaction involved.(ii)When the above stated compound 'A' reacts with another compound 'B' having molecular formula $\displaystyle \mathrm{C}_{2} \mathrm{H}_{6} \mathrm{O}$ in the presence of an acid, a sweet smelling compound 'C' is formed.(1)Identify 'B' and 'C'.(2)State the role of acid in this reaction.(3)Write chemical equation for the reaction involved.(i)Name the compound formed when ethanol is heated at $\displaystyle 443$ K in the presence of conc. $\displaystyle \mathrm{H}_{2} \mathrm{SO}_{4}$ and draw its electron dot structure. State the role of conc. $\displaystyle \mathrm{H}_{2} \mathrm{SO}_{4}$ in this reaction.(ii)What is hydrogenation ? Explain it with the help of a chemical equation. State the role of this reaction in industry.
(i)
A compound 'A' with a molecular formula of $\displaystyle \mathrm{C}_{2} \mathrm{H}_{4} \mathrm{O}_{2}$ reacts with a base to give salt and water. Identify 'A', state its nature and the name of the functional group it possesses. Write chemical equation for the reaction involved.
(ii)
When the above stated compound 'A' reacts with another compound 'B' having molecular formula $\displaystyle \mathrm{C}_{2} \mathrm{H}_{6} \mathrm{O}$ in the presence of an acid, a sweet smelling compound 'C' is formed.
(1)
Identify 'B' and 'C'.
(2)
State the role of acid in this reaction.
(3)
Write chemical equation for the reaction involved.
(i)
Name the compound formed when ethanol is heated at $\displaystyle 443$ K in the presence of conc. $\displaystyle \mathrm{H}_{2} \mathrm{SO}_{4}$ and draw its electron dot structure. State the role of conc. $\displaystyle \mathrm{H}_{2} \mathrm{SO}_{4}$ in this reaction.
(ii)
What is hydrogenation ? Explain it with the help of a chemical equation. State the role of this reaction in industry.
Marking-scheme solution
(a) (i) \(\displaystyle \mathrm{A}=\mathrm{CH}_{3} \mathrm{COOH} /\) (Ethanoic acid) / Acetic acid
Nature = acidic
Functional group = - COOH / (carboxylic acid)
\(\displaystyle \mathrm{CH}_{3} \mathrm{COOH}+\mathrm{NaOH} \rightarrow \mathrm{CH}_{3} \mathrm{COONa}+\mathrm{H}_{2} \mathrm{O}\)
(ii) ($\displaystyle 1$) B - Ethanol / Ethyl alcohol / \(\displaystyle \mathrm{C}_{2} \mathrm{H}_{5} \mathrm{OH}\)
C - Ester / Ethyl ethanoate / Ethyl acetate
(2) Acid acts as a Catalyst in this reaction
acid
OR
(b) (i) Ethene/ \(\displaystyle \mathrm{C}_{2} \mathrm{H}_{4}\)
As a dehydrating agent
(ii) • The process in which unsaturated hydrocarbons/compounds react with hydrogen in the presence of a catalyst (Ni / Pd) to give saturated hydrocarbon.
Used in the hydrogenation of vegetable oils which are converted into fats with saturated carbon chains.More from Metals and Non-metals
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CBSE Class 10 Science past-paper question from the 2023board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.