Which formula represents an alkene?

The question is incomplete, here is a complete question.

Which formula represents an alkene?

(a)

(b)

(c)

(d)

Answer : The correct option is, (b)

Explanation :

Hydrocarbons are the type of organic compound that contains only hydrogen and the carbon atoms.

Saturated hydrocarbon : These are those hydrocarbons in which all carbon atoms and hydrogen atoms are bonded together with single bonds. The general formula of saturated hydrocarbon (alkane) is,

For example : Methane, Ethane, etc.

Unsaturated hydrocarbon : These are those hydrocarbons in which carbon-carbon atom bonded together with double or triple covalent bonds.

The general formula of unsaturated double bond hydrocarbon (alkene) is,

The general formula of unsaturated triple bond hydrocarbon (alkyne) is,

For example : Ethene, Butyne, etc.

As per question,

(a) : It is a saturated hydrocarbon and the name of this hydrocarbon is methane.

(b) : It is an unsaturated hydrocarbon and the name of this hydrocarbon is ethene.

(c) : It is a saturated hydrocarbon and the name of this hydrocarbon is ethane.

(d) : It is a saturated hydrocarbon and the name of this hydrocarbon is ethanol.

Hence, the formula represents an alkene is,

what's the