✓ Board-verified
Science · 2026 · 5 marks
CBSE 2026 · Region 2 · Set 1 · Q29
Attempt either (a) or (b): (a) A carbon compound 'P' of molecular formula C_2 H_6 O is found to be neutral when tested with red and blue litmus. A…
Attempt either (a) or (b) :
A carbon compound 'P' of molecular formula $\displaystyle \mathrm{C}_{2} \mathrm{H}_{6} \mathrm{O}$ is found to be neutral when tested with red and blue litmus. A gas that burns with a pop sound is produced when sodium metal reacts with compound 'P'.
(i)
Identify the compound 'P'.
(ii)
The carbon compound 'P' is heated with conc. $\displaystyle \mathrm{H}_{2} \mathrm{SO}_{4}$ at $\displaystyle 443$ K to produce compound 'Q'.
(I)
Write the chemical equation for the reaction.
(II)
What is the role of conc. $\displaystyle \mathrm{H}_{2} \mathrm{SO}_{4}$ in this reaction ?
(iii)
What is likely to be observed on heating compound 'P' with ethanoic acid with an acid as a catalyst? Write the chemical equation for the reaction.
(i)
Write the structural formula of benzene.
(ii)
State the reason why carbon can neither form $\displaystyle \mathrm{C}^{4+}$ cation nor $\displaystyle \mathrm{C}^{4-}$ anion.
(iii)
What type of bond is formed between carbon and hydrogen ?
(iv)
How is ethanol converted to ethanoic acid ?
(v)
Complete the following chemical equation : $\displaystyle 5 \times 1=5$ \[\mathrm{CH}_{3} \mathrm{COOC}_{2} \mathrm{H}_{5}+\mathrm{NaOH} \longrightarrow \]
Marking-scheme solution
(i)
$\displaystyle \mathrm{P}-\mathrm{Ethanol} / \mathrm{C}_{2} \mathrm{H}_{5} \mathrm{OH} / \mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{OH}$
(ii)(I)
\[\mathrm{CH}_{3}-\mathrm{CH}_{2} \mathrm{OH} \xrightarrow[\mathrm{H}_{2} \mathrm{SO}_{4}]{\text { Hot Cone. }} \mathrm{CH}_{2}=\mathrm{CH}_{2}+\mathrm{H}_{2} \mathrm{O}
\]
(II)
Dehydrating agent / Catalyst
(iii)
Sweet smelling compound/ester is formed.
\[\mathrm{CH}_{3}-\mathrm{COOH}+\mathrm{CH}_{3}-\mathrm{CH}_{2} \mathrm{OH} \xlongequal{\mathrm{Aeld}} \mathrm{CH}_{3}-\mathrm{C}-\mathrm{O}-\mathrm{CH}_{1}-\mathrm{CH}_{3}+\mathrm{H}_{2} \mathrm{O}
\]
(i)
(ii)
Carbon cannot form $\displaystyle \mathrm{C}^{4+}$ cation because removal of four
electrons is energetically not possible. Carbon cannot form C4
anion because nucleus with six protons cannot hold ten
electrons.
(iii)
Covalent bond
(iv)
\[\mathrm{CH}_{3}-\mathrm{CH}_{2} \mathrm{OH} \frac{\text { Alkaline } \mathrm{KMnO}_{4}+\text { Heat }}{\text { Or acidified } \mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}+\text { Heat }} \mathrm{CH}_{3} \mathrm{COOH}
\]
Ethanol is converted to Ethanoic Acid by adding Alkaline
$\displaystyle \mathrm{KMnO}_{4} /$ Acidified $\displaystyle \mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}$ as oxidising agent.
(v)
\[\mathrm{CH}_{3} \mathrm{COOC}_{2} \mathrm{H}_{5} \xrightarrow{\mathrm{NaOH}} \mathrm{C}_{2} \mathrm{H}_{5} \mathrm{OH}+\mathrm{CH}_{3} \mathrm{COONa}
\]
All Carbon and its Compounds questions2026 question paperNCERT solutions: Carbon and its CompoundsPractice Carbon and its Compounds →
More from Carbon and its Compounds
- The number of single and double bonds present in a molecule of benzene (C_6 H_6) respectively, are:2024
- Which one of the following hydrocarbons is different from the others?2024
- Draw two different possible structures of a saturated hydrocarbon having four carbon atoms in its molecule. What are these two structures of the…2022
- Hydronium ions are formed by the reaction between:2023
- The number of electrons in the outermost shell of the atom of a non-metal can be:2023
- (i) Butane had both Carbon - Carbon bonds as well as Carbon - Hydrogen bonds. Draw its structural formula and state the number of (1) C-H bonds and…2023
- The melting and boiling points of carbon compounds are generally low and they are largely non-conductors of electricity. State two conclusions based…2024
- Select the correct option(s) in the following table:2023
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.