Which one of the following dienes would you expect to be the most stable ?

Which one of the following acids would you expect to be the strongest?

Which one of the following acids would you expect to be the strongest?

Which one of the following acids would you expect to be the strongest ?

By considering their position in the periodic table, which one of the following elements would you expect to have the most metalllic characteristics? Ga Ge As Se Be.

Which one of the following would you expect to be the most acidic hydrogen site ?