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Science · 2023 · 5 marks
CBSE 2023 · Region 4 · Set 1 · Q34
(A) (i) Draw the structure of the following compounds: (ii) How are structure (i) and structure (ii) given below related to one another? Give reason…
(i)
Draw the structure of the following compounds:
(ii)
How are structure (i) and structure (ii) given below related to one another? Give reason to justify your answer.
Structure (i) Structure (ii) Draw one more possible structure for above case.
(iii)
Differentiate between saturated and unsaturated carbon compounds on the basis of their general formula.
(i)
What happens when a small piece of sodium is dropped in ethanol? Write the equation for this reaction.
(ii)
Why is glacial acetic acid called so?
(iii)
What happens when ethanol is heated at $\displaystyle 443$ K in the presence of conc. $\displaystyle \mathrm{H}_{2} \mathrm{SO}_{4}$? Write the role of conc. $\displaystyle \mathrm{H}_{2} \mathrm{SO}_{4}$ in this case.
(iv)
Write an equation showing saponification.
Marking-scheme solution
\(\displaystyle \frac{1}{2}\) $\displaystyle 1$
Hot Conc. \(\displaystyle \mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{OH} \xrightarrow[\mathrm{H}_{2} \mathrm{SO}_{4}]{ } \mathrm{CH}_{2}=\mathrm{CH}_{2}+\mathrm{H}_{2} \mathrm{O}\) Ethene - \(\displaystyle \mathrm{H}_{2} \mathrm{SO}_{4}\) - Dehydrating agent / removes water from Ethanol (iv) \(\displaystyle \mathrm{CH}_{3} \mathrm{COOCH}_{2} \mathrm{CH}_{3} \xrightarrow{\mathrm{NaOH}} \mathrm{CH}_{3} \mathrm{COO}^{-} \mathrm{Na}^{+}+\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{OH}\)
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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.