A molecule ("P") on treatment with acid undergoes rearrangement and gives ("Q") ("Q") on ozonolysis followed by reflux under alkaline condition gives ("R"). The structure of ("R") is given below :

The structure of ("P") is

 

Note : In question about molecule “P” is not clarified, weather it is alcohol or alkene and as in question language rearrangement product is asking
hence according to question language ans. is either (2) or (4). As alkene also undergoes rearrangement in presence of acid but option (2) also fulfil all
conditions.