Final answer:
Rearrangement can occur in alkyl carbocations during a solvolysis reaction, but not in alkanes, alkenes, or alkyl halides.
Step-by-step explanation:
In a solvolysis reaction, rearrangement can occur in alkyl carbocations. An alkyl carbocation is a positively charged carbon atom surrounded by alkyl groups. When the reaction occurs, the rearrangement of bonds can result in different isomers or structures. This rearrangement does not happen in alkanes, alkenes, or alkyl halides.