The Strange Orange Hunt (Especially In the Off Season)!

Once there lived a guy *Akhoury * with his girlfriend.He was very reckless and lazy that made his girlfriend very angry.She decide to make teach him a lesson,she demanded that she wants to eat oranges which after fighting he had to accept.(He loved his girlfriend very much)

As he didn't know where to find it he stopped a man(who was a physics professor) and shared his problem.The man after listening told that he know a man who could help him find oranges but he has to solve some small questions.

A Small body A is fixed to inside of a thin hoop of radius R and mass equal to that of body A.The hoop rolls without slipping over a horizontal plane;at the moments when the body get into the lower position ,the center of loop moves with velocity V shown in figure.At what value of V will the hoop move without bouncing?

The answer comes out to be $\sqrt{AgR}$ (where g=accelaration due to gravity)

Then he asked a small riddle that

The temperature of atmosphere is 30 degree celsius if it takes 6 minutes to cool down from 61 to 59 degree celsius then whether it will take same time to cool down

1 FOR YES 2 FOR NO (This Answer can be called B)

Akhoury answered it and the man told him about the other man who was a fruitseller(the fruitseller was good in chemistry and maths).Akhoury went to the fruitseller and asked of oranges but then Akhoury realised that he forgot his wallet at home.Seeing this the shopkeeper told him that he can get the oranges only if he help him with his riddle,Akhoury has no choice but to agree with him

THE RIDDLE WAS

*two boys were playing chess in 8 8 square board one came up with the idea that shorten it to 4 4 and see it in 3-D assuming elements on the corner and face centres we can imagine it to be a perfect square lattice comprising of cation and anion Listening to this the other one said if keep the radius ratio between a certain limit comprising of chlorine at corners and face centres and when doped with aluminium 2 cation vacancies are created and co-ordination number 6 the radius ratio comes out to be" C" Also he said that considering only the outline we can get a type of organic compound in bond line formula which when drawn with alternate double bonds give a compound which is highly reactive To this the first one said that the outline giving compound is most stable when comprises of "D" members *

What is B and C?? *

Listening to this Akhoury was very happy as he knew the answer so he solved the riddle and went back to his love with her oranges!!!!!!!

*WHAT IS A+B+C+D *