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Science · 2022 · 3 marks
CBSE 2022 · Region 2 · Set 1 · Q9
Consider the following organic compounds: (i) (ii) (a) Name the functional group present in their compounds. (b) Write the general formula for the…
Consider the following organic compounds :
(i)
(ii)
(a)
Name the functional group present in their compounds.
(b)
Write the general formula for the compounds of this functional group.
(c)
State the relationship between these compounds and draw the structure of any other compound having similar functional group.
OR
(a)
Draw the electron dot structure for ethyne.
(b)
List two differences between the properties exhibited by covalent compounds and ionic compounds.
Marking-scheme solution
(a)
Aldehyde
(b)
$\displaystyle \mathrm{C}_{\mathrm{n}} \mathrm{H}_{2 \mathrm{n}+1} \mathrm{CHO} / \mathrm{R}-\mathrm{CHO}$
(c)
They are homologues.
(a)
(b)
low melting point
low boiling point.
poor conductors of
electricity.
Ionic Compounds
high melting point
high boiling point.
good conductors of
electricity in molten state or
aqueous solution.
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CBSE Class 10 Science past-paper question from the 2022 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.