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Science · 2022 · 3 marks
CBSE 2022 · Region 1 · Set 1 · Q9
Draw two different possible structures of a saturated hydrocarbon having four carbon atoms in its molecule. What are these two structures of the hydrocarbon having same molecular formula called ? Write the molecular formula and the common name of this compound. Also write the molecular formula of its alkyne.(b)Write the molecular formula of benzene and draw its structure.(ii)Write the number of single and double covalent bonds present in a molecule of benzene.(iii)Which compounds are called alkynes ?
Draw two different possible structures of a saturated hydrocarbon having four carbon atoms in its molecule. What are these two structures of the hydrocarbon having same molecular formula called ? Write the molecular formula and the common name of this compound. Also write the molecular formula of its alkyne.
(b)
Write the molecular formula of benzene and draw its structure.
(ii)
Write the number of single and double covalent bonds present in a molecule of benzene.
(iii)
Which compounds are called alkynes ?
Marking-scheme solution
•
Isomers
$\displaystyle \mathrm{C}_{4} \mathrm{H}_{10}$
Butane
$\displaystyle \mathrm{C}_{4} \mathrm{H}_{6}$
i) $\displaystyle \bullet \mathrm{C}_{6} \mathrm{H}_{6}$
(ii)
Single bond $\displaystyle 9$
-Double bond $\displaystyle 3$
(iii)
Hydrocarbons containing triple bond
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CBSE Class 10 Science past-paper question from the 2022board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.