```python
from typing import List

def hop_chain(hops: List[tuple]) -> bool:
    """
    Determines if the given list of hops form a continuous chain.
    
    Parameters:
    hops (List[tuple]): A list of tuples where each tuple represents a hop with the start and end positions.
    
    Returns:
    bool: True if the hops form a continuous chain, False otherwise.
    """
    if not hops or len(hops) == 1:  # Single hop or empty list
        return True
    
    start, end = hops[0]
    
    for hop in hops[1:]:
        if hop[0] != end:  # Check if the start of the next hop is the end of the current hop
            return False
        end = hop[1]  # Update the end position for the next hop
    
    return True
```