a. How many isomers are possible for the compound with the molecular
formula C 4 H 8 ? Draw the electron dot structure of branched chain isomer.
b. How will you prove that C 4 H 8 and C 5 H 10 are homologues?
4 isomers are Possible with C4H8 as shown below
Organic Compounds having similar molecular formula but different structures
It is possible only in hydrocarbons having 4 or more carbon atoms
1-butene, cis-2-butene, trans-2-butene, and isobutylene.
Branched Chain Isomer
In this case,3 carbon atom are put in straight chain
Fourth Carbon atom is put in side as shown below
b. C 4 H 8 and C 5 H 10 are homologues
as they differ in
● “- CH 2 -”
● differ in 14u molecular mass
● Same functional group
● Same general formula
(Any two reasons)
Homologues are group of chemical compounds which have similar structure and similar chemical properties and successive compounds differ by CH2
Example of Homologues Series of Alkenes
It can be seen that
Difference between C4H8 and C5H10 is CH2
Also these 2 share similar structure and chemical properties (both are alkenes)
Hence these are homologues