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Question

CnH2n+2 is the general formula of a homologous series of hydrocarbons.
i) Is this series saturated or unsaturated?
ii) Name the series described above. Give the formula and name of the member with two carbon atoms.
iii) Draw the structural formula of the first member of this series.
iv) Define the homologous series and find the common difference between the successive members of this family.
v) Write the formula of n-butane and n-pentane.

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Solution


(i) CnH2n+2 corresponds to general formula of alkanes. Since, alkanes are saturated so this series is saturated series.
(ii) Alkanes
C2H2×2+2=C2H6
H3CCH3(Ethane)
(iii) Methane with molecular formula CH4 is first member of this series.
(Refer to Image)
(iv) Homologous series is a series of compounds with same functional group. They have similar chemical properties and physical properties. Compounds of same homologous series have same general formula.
Common difference between successive members of family is CH2 group.
(v) n-butane
C4H10
CH3CH2CH2CH3
n-pentane
C5H12
CH3CH2CH2CH2CH3

1060907_622976_ans_86616ce99c6e4fd890dfdcd579d6cc33.PNG

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