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Science · 2022 · 2 marks
CBSE 2022 · Region 4 · Set 3 · Q6
Consider the carbon compounds having following molecular formula: (i) C_2 H_2 (ii) C_2 H_6 (iii) C_3 H_7 OH (iv) C_2 H_5 COOH (v) CH_3 CHO (a)…
Consider the carbon compounds having following molecular formula :
(i)
$\displaystyle \mathrm{C}_{2} \mathrm{H}_{2}$
(ii)
$\displaystyle \mathrm{C}_{2} \mathrm{H}_{6}$
(iii)
$\displaystyle \mathrm{C}_{3} \mathrm{H}_{7} \mathrm{OH}$
(iv)
$\displaystyle \mathrm{C}_{2} \mathrm{H}_{5} \mathrm{COOH}$
(v)
$\displaystyle \mathrm{CH}_{3} \mathrm{CHO}$
(a)
Identify which one of the above compounds, is a member of aldehyde series.
(b)
Write the general formula of the series to which compound $\displaystyle \mathrm{C}_{2} \mathrm{H}_{2}$ belongs.
(c)
Which one of the above compounds has triple bonds between carbon - carbon atoms?
(d)
Write the molecular formula of the first member of the homologous series to which the compound $\displaystyle \mathrm{C}_{3} \mathrm{H}_{7} \mathrm{OH}$ belongs.
Marking-scheme solution
(a) \(\displaystyle \mathrm{CH}_{3} \mathrm{CHO}\)
(b) \(\displaystyle \mathrm{C}_{n} \mathrm{H}_{2 n-2}\)
(c) \(\displaystyle \mathrm{C}_{2} \mathrm{H}_{2}\)
(d) \(\displaystyle \mathrm{CH}_{3} \mathrm{OH}\)
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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.