must undergo addition because they have easily broken π bonds. rule states in the addition of HX to an unsymmetrical alkene, the H atom bonds to the less substituted carbon atom. are unsaturated hydrocarbons because they have fewer than the maximum number of hydrogen atoms per carbon. have good leaving groups and therefore readily undergo substitution and elimination reactions. In hydroboration, the boron atom bonds to the substituted carbon.

Alkenes, Markovnikov's, Alkenes, Alkyl halides, and less.

Explanation:

Alkenes must undergo addition because they have easily broken π bonds.

Markovnikov's rule states in the addition of HX to an unsymmetrical alkene, the H atom bonds to the less substituted carbon atom.

Alkenes are unsaturated hydrocarbons because they have fewer than the maximum number of hydrogen atoms per carbon.

Alkyl halides have good leaving groups and therefore readily undergo substitution and elimination reactions.

In hydroboration, the boron atom bonds to the less substituted carbon.

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