Answer :
Answer: Option (2) is the correct answer.
Explanation:
An alkene is a molecule that contains a hydrocarbon chain with atleast one double bond.
For example, [tex]H_{2}C=CH-CH_{2}-CH_{3}[/tex] is a 1-butene molecule and it contains one double bond that consists of four shared electrons.
On the other hand, a molecule of hydrocabon that contains a triple bond is known as an alkyne. Whereas a hydrocarbon that contains only single bonds is known as an alkane.
Thus, we can conclude that the multiple covalent bond in a molecule of 1-butene is a double covalent bond that has 4 shared electrons.
