Who is generally closer to the kids, mom or dad?

(it's a funny riddle)

There was a kingdom in which the king had no heir to take over his thrown. Even the queen was dead and he himself was on the verge of dying. He thought about it and then summoned all of the teenagers. He gave one seed each to all of them and asked them to grow the plant. He announced that the one with the most beautiful plant will become the king/queen of the empire after the death of the king.

After a month, all of them were called. The king looked at all of the plants but announced the girl with an empty pot as the queen of the empire. Why?

I am 5 letters long.
My first two tell you who I am
My first 3 could be a medicine
My last three reversed could be a young boy.
My 4th, 3rd and 2nd in that order could be a fruit drink.
If you have me you may hang me round your neck
WHAT AM I ?

A man in a car saw a Golden Door, Silver Door and a Bronze Door. What door did he open first?

In the picture given below, can you find out which digit will take place of the question mark?

Two boys wish to cross a river. The only way to get to the other side is by boat, but that boat can only take one boy at a time. The boat cannot return on its own, there are no ropes or similar tricks, yet both boys manage to cross using the boat.

How?

What does this mean?

CCCCCCC

What is the next number in this series?

4,12,84,3612....

Can you count the number of seconds in a year?

Clue: You need to bother about calculation.

Rearrange the letters in "new door" to make one word.