"confused on whether" is correct and usable in written English.
You can use it when you are not sure of a decision or opinion. For example: I was confused on whether I should enroll in the accounting class or the computer science class.
When they reached him they were confused on whether either had shot him, he said.
"Until now the Shias of Iraq and the followers of Sistani were confused on whether to take up arms against the Americans, whether to fight," said a spokesman.
His father took his mother's sister as a second wife when he was about 7. "I remember being confused on whether I should call her aunt or stepmother," he said in an interview.
A1 Russia Unclear on U.S. Plan The defense minister said Russia was confused on whether the Bush administration was planning to withdraw from, negotiate changes to or simply "bump up against" the Antiballistic Missile Treaty in testing a missile defense system.
While consumers worldwide are still confused on whether talc is dangerous or not, the American Cancer Society itself provided us with a possible solution.
At $53 million, Valentine's Day had the second-biggest opening ever for a romantic comedy right below Sex and the City 2. And if you're still confused on whether Valentine's Day sucks (again, the movie not the holiday which clearly sucks), I'm here to tell you that, definitively, it sucked the first time I saw, it and it still sucks.
But Romney is confused on this one.
I am confused on this one.
Only ask what you're confused on though, because teachers can tell whether or not you are confused.
The rabbi sounded distraught and confused on the tape, not understanding the dispatcher's questions about whether his wife was breathing, or whether there was a weapon visible.
I'm still very confused on that.
