1 )Lewis acid question as it has two option correct.

2) oxidation no of Cr.

3) elastion collision question of physics I.e the value of e in this is greater than which is practically not possible.

4) question of chemistry that asked the what is the major product when it react with NaoMe,MeoH , the answer must be sn2 product but the answer given is E2 product

Hope this helps!!