CBSE Class 10 Science 2022 Outside Delhi Term II Set 2

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Question : 1
Total: 7
Consider the following molecular formulae of carbon compounds:
(i) CH3COOH
(ii) CH3OH
(iii) C2H6
(iv) C3H4 (iv) C4H8
(a) Which one of these compounds belongs to homologous series of alcohols?
(b) Identify the compound having triple bond between carbon - carbon atoms.
(c) Write the molecular formula of the first member of the homologous series to which CH3COOH belongs.
(d) Write the general formula of the series to which the compound C4H8 belongs.
Solution:  
(a) CH3OH, methanol belongs to homologous series of alcohols and it has the general formula of ROH.
(b) C3H4
Lewis Structure of C3H4
H
H
|
C
|
H
C
CH

(c) Ethanoic acid is a member of homologous series with general formula CnH2n+1COOH. The molecular formula is HCOOH (Methanoic acid).
(d) The general formula for alkenes can be written as CnH2n where n=2,3,4 and C4H8 belongs to alkene series.
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