Question

Is the bold word or phrase a misplaced modifier?
Hermione Granger looked through a whole classmate's collection of baseball cards.
Bold is whole

Answer 1

Yes.

a whole classmate's collection vs a classmate's whole collection

If you don't know what a modifier is, it's basically a noun or adjective that modifies a 'head noun.'

For example.

"The great red koala bear"

With great and red being modifiers.

Answer 2

Replacing whole with entire also helps with identifying it.

an entire classmate's collection vs a classmate's entire collection

Just another modifier to help illustrate.