Q26 of 312 Page 240

The general formula of a homologues series of carbon compounds is CnH2n. Write the molecular formulae of the second and fourth members of the series.

The general formula of homologues series of alkenes is CnH2n. The molecular formula of second member of alkenes series is C3H6. The second member of alkenes series contains three carbon atoms.

The molecular formula of fourth member of alkenes series is C5H10.



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25 Fill in the following blanks with suitable words:

(a) The next higher homologues of ethanol is ………………


(b) The next homologues of C2H5OH is ……………………………….


(c) The next higher homologues of ethane is …………………………..


(d) The functional group present in ethanol is ………………………..


(e) Organic compounds having ----- PICTURE---- OH functional group are known as ………………………….

 26 Give the general name of the class of compounds having the general formula CnH2n-2. Write name of the first member of this homologues series. 26 Write the molecular formulae of the third and fifth members of homologues series of carbon compounds represented by the general formula CnH2n+2 27 (a) Give the names and structural formulae of the next two higher homologues of methane.

(b) The molecular formula of a hydrocarbon is C2H5. Name its homologues series.


(c) Select the hydrocarbons which are members of the same homologues series. Give the name of each series. C5H10; C3H8; C4H10; C7H12; C8H16