These hydrocarbons contain one or more double or triple bonds between the two adjacent carbon atoms in their structure:

Explanation

Alkenes are unsaturated hydrocarbons characterized by at least one carbon-carbon double bond (C=C) and have the general formula CₙH₂ₙ. They are more reactive than alkanes due to the presence of the double bond, allowing for various chemical reactions such as addition reactions. In contrast, alkynes are also unsaturated hydrocarbons but contain at least one carbon-carbon triple bond (C≡C), with the general formula CₙH₂ₙ₋₂. Alkynes are even more reactive than alkenes, making them useful in a variety of chemical synthesis processes. Both alkenes and alkynes are essential in organic chemistry, serving as key intermediates and building blocks for more complex organic compounds.