Deduction 80c,80d,80ttq

Yes. Deductions under sections 80C, 80D and 80TTA are fully allowable in a belated return filed under section 139(4), provided you opt for the old tax regime and all conditions of the respective sections are satisfied.
There is no prohibition in section 80AC for these deductions.
The claim is valid even if the return is filed after the due date, but before the end of the assessment year.