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I have a problem with a word order (verb and adjective) in the following sentences:

What interesting do you find about this book? (1)
or
What do you find interesting aboutthis book?(2)

What particularly interesting were you doing yesterday?(3)
or
What were you doing particularly interesting that you think was interesting?(4)

Please, help me.
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I find these to be natural expressions:

What do you find interesting about this book? (2a)

What were you doing (that was) particularly interesting yesterday? (4a)
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thank you for help. I conclude that adjectives come after predicate in what- type questions.
Referring to this rule, sentence:

What do you think interesting about the book you are reading?

should be correct, should'nt be.
Yes, it is. Because it sounds a bit formal on the tongue, the spoken sentence would more likely be:

'What do you think is interesting about the book you are reading? '