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Science · 2026 · 5 marks
CBSE 2026 · Region 3 · Set 1 · Q29
Attempt either (a) or (b): (a) (i) What is homologous series? Which two of the following organic compounds belong to the same homologous series? C_2…
Attempt either (a) or (b) :
(i)
What is homologous series ? Which two of the following organic compounds belong to the same homologous series ? $\displaystyle \mathrm{C}_{2} \mathrm{H}_{4}, \mathrm{C}_{4} \mathrm{H}_{10}, \mathrm{C}_{3} \mathrm{H}_{4}, \mathrm{C}_{4} \mathrm{H}_{8}$
(ii)
Write the product(s) in the following reactions :
(I)
$\displaystyle \mathrm{CH}_{3}-\mathrm{CH}_{2}-\mathrm{OH}+\mathrm{CH}_{3} \mathrm{COOH} \xrightarrow{\text { Acid }}$
(II)
$\displaystyle \mathrm{C}_{2} \mathrm{H}_{5} \mathrm{OH}+\mathrm{O}_{2} \xrightarrow{\text { Burning }}$
(iii)
Why does micelle formation take place when soap is added to water ?
(i)
Name the following compounds :
(I)
(II)
(ii)
Name the reaction which is commonly used in the conversion of vegetable oils to fats.
(iii)
Why is the melting point of $\displaystyle \mathrm{C}_{4} \mathrm{H}_{10}$ higher than $\displaystyle \mathrm{C}_{3} \mathrm{H}_{8}$ ?
(iv)
What happens when a piece of sodium is dropped into ethanol ?
(v)
Write the products in the following reaction : $\displaystyle 5 \times 1=5$ \[\mathrm{CH}_{3} \mathrm{COOC}_{2} \mathrm{H}_{5}+\mathrm{NaOH} \longrightarrow \]
Marking-scheme solution
(a) (i)
(balancing may be ignored)A series of compounds in which the same functional group substitutes for hydrogen in a carbon chain. / Can be represented by a single general formula and successive members differ by \(\displaystyle -\mathrm{CH}_{2}\) unit or 14u.
\(\displaystyle \mathrm{C}_{2} \mathrm{H}_{4}\) and \(\displaystyle \mathrm{C}_{4} \mathrm{H}_{8}\) belong to the same homologous series/ are alkenes.
(ii) (I) \(\displaystyle \mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{OH}+\mathrm{CH}_{3} \mathrm{COOH} \xrightarrow{\text { Acid }} \mathrm{CH}_{3} \mathrm{COOC}_{2} \mathrm{H}_{5}+\mathrm{H}_{2} \mathrm{O}\)
(II) \(\displaystyle \mathrm{C}_{2} \mathrm{H}_{5} \mathrm{OH}+3 \mathrm{O}_{2} \xrightarrow{\text { Burning }} 2 \mathrm{CO}_{2}+3 \mathrm{H}_{2} \mathrm{O}\)
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CBSE Class 10 Science past-paper question from the 2026 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.