No you can't
Instantly, the police appeared on the scene.
I instantly shot an arrow at the person who was about to kill me.
The whole building was instantly engulfed in flames.
Yes. There is no English word that cannot end a sentence.
noA sentence cannot end with the word "the". Hmmm, wait a minute.
The word "incidentally" can be used at the end of a sentence. You can make the sentence "This was done incidentally.".
no it doesn't because it is a punctuation not a word
She had a good-natured laugh that instantly put me at ease.
No, if you end a sentence with the word of, it would be an incomplete sentence. There will always be other words or at least one word that follows the word of in a sentence.
I got my answer instantly. The hot chocolate was instantly prepared.
No.
It may be. There is no word in English that cannot begin or end a sentence. The idea that certain word are unfit to end a sentence comes from Latin grammar, not English.