g Alkenes and alkynes are called unsaturated compounds because . they have fewer hydrogen atoms attached to the carbon chain than alkanes they have fewer carbon atoms than alkanes they have the maximum number of hydrogen atoms attached to each carbon in the compound they have more carbon atoms than alkanes they have more hydrogen atoms attached to the carbon chain than alkanes

They have fewer hydrogen atoms attached to the carbon chain than alkanes

Explanation:

Let's compare ethane (an alkane) with ethene (an alkene) and ethyne (an alkyne):

As you can see, alkenes and alkynes have fewer hydrogen atoms attached to the carbon chain due to them having multiple bonds between the carbon atoms.

we need the questions , i may then you.

a. energy is absorbed in the reaction.

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.