Question

Alkenes: give its name, molecular formula, structural formula, two chemical reactions and two uses in everyday life.

Answer 1

• A homologous series is a set of molecules having the same functional group and similar chemical characteristics in organic chemistry.
• Alkenes are a group of hydrocarbons in which at least one double is present between two Carbon atoms ($\mathrm{C}$).
• Ethene (${\mathrm{CH}}_2={\mathrm{CH}}_2$) is a member of the Alkenes group.
• The molecular formula of Ethene is $C_2{H}_4$.
• The structural formula of Ethene is given below:

Chemical reaction of Ethene is given below:

(a) Combustion of Ethene: Combustion of Ethene will produce Carbon dioxide (${\mathrm{CO}}_2$) and Water (${\mathrm{H}}_2\mathrm{O}$).

The reaction is given below:

$\underset{\mathrm{Ethene}}{{\mathrm{C}}_2{\mathrm{H}}_4\left(\mathrm{g}\right)}+\underset{\mathrm{Oxygen}}{3{\mathrm{O}}_2\left(\mathrm{g}\right)}⟶\underset{\mathrm{Carbon}\mathrm{dioxide}}{2{\mathrm{CO}}_2\left(g\right)}+\underset{\mathrm{Water}}{2{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)}$

(b) Polymerization reaction of Ethene: Polymerization reaction of Ethene will produce Polyethene.

The reaction is given below:

$\underset{\mathrm{Ethene}}{\mathrm{n}[{\mathrm{CH}}_2={\mathrm{CH}}_2]}⟶\underset{\mathrm{Polyethene}}{{[ー{\mathrm{CH}}_2ー{\mathrm{CH}}_2ー]}_{\mathrm{n}}}$

Uses of Ethene

• Ethene is used as an anesthetic.
• Ethene is used in welding metals.