Question on: JAMB Chemistry - 2023

An alkene contains at least one carbon-carbon double bond (C=C). A double bond consists of one sigma ((\sigma)) bond and one pi ((\pi)) bond. Since the question specifies an alkene, and it is implied that it has one double bond, the number of pi bonds will be 1.

However, the question does not say anything about having only one double bond. The question describes an alkene, and the options refer to the total number of pi bonds. Since a double bond consists of one (\pi) bond, we must determine how many double bonds exist in a six-carbon chain. If we assume it has only one double bond, it has one (\pi) bond. If we interpret the question as asking about a general alkene with six carbon atoms and we can have multiple double bonds. The number of (\pi) bonds must be greater than or equal to 1. Since none of the answers say 1 or greater than 1, the question could be flawed. However, based on the options, let's consider the maximum possible number of (\pi) bonds: if we have 3 double bonds (each with one (\pi) bond and one (\sigma) bond), we would then have a total of 3 (\pi) bonds in the six-carbon structure.

Therefore, the answer is 3.