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Science · 2024 · 4 marks
CBSE 2024 · Region 5 · Set 1 · Q37
Carbon is a versatile element that forms the basis of all living organisms and many of the things we use. A large variety of compounds is formed…
Carbon is a versatile element that forms the basis of all living organisms and many of the things we use. A large variety of compounds is formed because of its tetravalency. Compounds of carbon are formed with oxygen, hydrogen, nitrogen, sulphur, chlorine and many other elements. Answer the following questions :
(a)
What are hydrocarbons ?
(b)
List two properties by virtue of which carbon can form a large number of compounds.
(c)
(i)
Write the formula of the functional group present in
(1)
aldehydes, and ($\displaystyle 2$) ketones. Write chemical equation for the reaction that occurs between ethanoic acid and ethanol in the presence of a catalyst.
OR
(ii)
What are structural isomers ? Write the structures of two isomers of butane $\displaystyle \left(\mathrm{C}_{4} \mathrm{H}_{10}\right)$.
Marking-scheme solution
(a)
Compounds formed by carbon and hydrogen only.
(b)
Tetravalency and Catenation
(c)
(2)
Compounds with identical molecular formula but different structures
Two isomers of butane $\displaystyle \mathrm{C}_{4} \mathrm{H}_{10}$
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CBSE Class 10 Science past-paper question from the 2024 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.