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Science · 2023 · 5 marks
CBSE 2023 · Region 2 · Set 1 · Q34
(a) An acid 'X' and an alcohol 'Y' react with each other in the presence of an acid catalyst to form a sweet smelling substance 'Z'. Identify 'X',…
An acid 'X' and an alcohol 'Y' react with each other in the presence of an acid catalyst to form a sweet smelling substance 'Z'. Identify 'X', 'Y' and 'Z'. Write the chemical equation for the reaction involved and name it. The substance 'Z' on treatment with sodium hydroxide produces back the alcohol 'Y' and sodium ethanoate. Write the chemical equation for the reaction involved and name it, giving justification for the name.
(i)
Name the simplest saturated hydrocarbon. Draw its electron dot structure. Which type of bonds exist in this compound ?
(ii)
Name any two mixtures of the carbon compound used as a fuel in daily life, of which the above mentioned compound is an important component.
(iii)
In which homologous series of carbon compounds can this compound be placed ? Write the general formula of the series.
(iv)
Which type of flame is produced on burning it ?
Marking-scheme solution
(a) 'X' - \(\displaystyle \mathrm{CH}_{3} \mathrm{COOH}\) / Ethanoic Acid / Acetic Acid 'Y' - \(\displaystyle \mathrm{C}_{2} \mathrm{H}_{5} \mathrm{OH}\) / Ethanol ' Z ' \(\displaystyle -\mathrm{CH}_{3} \mathrm{COOC}_{2} \mathrm{H}_{5}\) / Ethyl Ethanoate
\(\displaystyle \mathrm{CH}_{3} \mathrm{COOH}+\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{OH} \xrightarrow[\text { catlyst }]{\text { Acid }} \mathrm{CH}_{3} \mathrm{COOC}_{2} \mathrm{H}_{5}+\mathrm{H}_{2} \mathrm{O}\)
Esterification Reaction
\(\displaystyle \mathrm{CH}_{3} \mathrm{COOC}_{2} \mathrm{H}_{5} \xrightarrow{\mathrm{NaOH}} \mathrm{C}_{2} \mathrm{H}_{5} \mathrm{OH}+\mathrm{CH}_{3} \mathrm{COONa}\)
Saponification Reaction
It is used in the preparation of soap.
(b) (i) • Methane / \(\displaystyle \mathrm{CH}_{4}\)
Covalent bond / Single Covalent bond/ Single bond
(ii) Biogas; Compressed Natural gas / CNG
(iii) • Alkanes ;
\(\displaystyle \mathrm{C}_{\mathrm{n}} \mathrm{H}_{2 \mathrm{n}+2}\)
(iv) Clean flame/blue flame
All Carbon and its Compounds questions2023 question paperNCERT solutions: Carbon and its CompoundsPractice Carbon and its Compounds →
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CBSE Class 10 Science past-paper question from the 2023 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.