Question

Give any two differences between alkenes and alkanes.

Answer 1

. In the classification of the hydrocarbons alkanes and alkenes comes under saturation and unsaturated hydrocarbons. In order to understand these compounds we classified these hydrocarbons.

Complete step by step answer:
We know that there is a huge variety of compounds that are formed by carbon atoms along with the hydrogen. Almost all the things in our daily life are made up of carbon.
In order to understand these compounds we classified these hydrocarbons
In that classification of the hydrocarbons open chain hydrocarbons are further classified into two types
they are:
1. saturated hydrocarbons and
2. unsaturated hydrocarbons
Alkanes comes under saturated hydrocarbons and alkenes & alkynes come under unsaturated hydrocarbons.
The differences between these alkanes and alkenes are:

Alkanes	Alkenes
These are saturated hydrocarbons.	These are unsaturated hydrocarbons.
These compounds contain only single bonds which are sigma bonds.	These compounds contain one or more carbon carbon double bonds which composes of both sigma and pi bonds.
The general chemical formula is ${{C}_{n}}{{H}_{2n+2}}$	The general chemical formula is ${{C}_{n}}{{H}_{2n}}$
Bond length is longer than the alkenes.	Bond length is short compared to alkanes.

These are the major differences between the alkanes and alkenes apart from these there are many other differences that are physical properties like boiling point, melting point etc.

Note: All these are formed by the same carbon and hydrogen atoms but depending upon the formation of these compounds and the types of bonds made between the atoms change the properties of the compounds.