Okay, kiddo, let me explain cross-conjugation to you.
Imagine you have a long chain of toys, like a train track. Some of the toys in the chain can talk to each other and share things, while others can't. When the toys that can talk to each other are all next to each other, we call that "conjugation".
Now, let's say you have two separate chains of toys that can talk to each other, but they aren't attached to each other at all. When you put them together, they can still talk to each other, but not as easily as if they were all in the same chain. We call this "cross-conjugation".
Cross-conjugation happens when you have two parts of a molecule that can share electrons, but they are separated from each other by other parts of the molecule. It's like the toys that have to talk through other toys to reach each other. This can make it harder for the electrons to flow between the two parts of the molecule, which can affect the molecule's behavior.
So, basically, cross-conjugation is like having two separate groups in a molecule that can share stuff, but they have to do it indirectly because they're not right next to each other.