Oxford - Michael Swan - Practical English Usage
1- The people questioned gave very different opinions.
2- The questioned people gave very different opinions.
I have read the section 2 is wrong according to 'Oxford-Michael-Swan-Practical-English-Usage, page 403', but I couldn't understand why 2 is wrong.
Remember - if you don't use correct capitalisation, punctuation and spacing, anything you write will be incorrect.