(a) Write three properties of homologous series.
(b) Identify alkene and alkyne from the following.
(i) C2H6 (ii) C3H4
(iii) C3H6 (iv) C3H8.
(c) Draw electron dot structure of ethene.
(b) Identify alkene and alkyne from the following.
(i) C2H6 (ii) C3H4
(iii) C3H6 (iv) C3H8.
(c) Draw electron dot structure of ethene.
(a) Homologous
series is defined as a systematic order of organic compounds having same
functional group that can be represented by same general formula and prepared
by same method.
Each member of a
homologous series is known as homologue and this phenomenon is called homology.
Properties of homologous series are:
1. Two
consecutive members of a homologous series differs each other in their
composition by –CH2 unit.
Example:Alcohol
(−OH)−CH3OH,CH3CH2OH,CH3CH2CH2OH
2. The members of a homologous series can be represented by
same general formula. Example:Alcohol CnH2n+1OH
3. The members of a particular homologous series have almost
same chemical properties due to presence of same functional group.
(b) In organic
chemistry, an alkene is an unsaturated hydrocarbon that contains at least one
carbon–carbon double bond. They form a homologous series of hydrocarbons with
the general formula CnH2n. Alkynes are a series of
unsaturated hydrocarbons containing atleast one triple bond. They forma a
homologous series of hydrocarbons with the general formula CnH2n−2. So according to this, (iii) is alkene and (ii) is alkyne.
(c) As shown is image attached.
Each member of a homologous series is known as homologue and this phenomenon is called homology. Properties of homologous series are:
1. Two consecutive members of a homologous series differs each other in their composition by –CH2 unit.
Example:Alcohol (−OH)−CH3OH,CH3CH2OH,CH3CH2CH2OH
2. The members of a homologous series can be represented by same general formula. Example:Alcohol CnH2n+1OH
3. The members of a particular homologous series have almost same chemical properties due to presence of same functional group.
(b) In organic chemistry, an alkene is an unsaturated hydrocarbon that contains at least one carbon–carbon double bond. They form a homologous series of hydrocarbons with the general formula CnH2n. Alkynes are a series of unsaturated hydrocarbons containing atleast one triple bond. They forma a homologous series of hydrocarbons with the general formula CnH2n−2. So according to this, (iii) is alkene and (ii) is alkyne.
(c) As shown is image attached.
