What Deficiency does the below rebus represent?

VIT_MIN

They are three errirs in this question. Can you find them?

I’m tall when I’m young, and I’m short when I’m old. What am I?

What is the next number in the series?

15 29 56 108 208 ?

John went to meet his friend Jacob, but when he was about to reach the main gate, John notices that Jacob had a mighty dog who was fastened to the tree. The chain is long enough that it allows the dog to reach the main gate.

How can the John reach the main gate?

An ape is trying to climb on a pole that is 60 feet high. Due to the slippery surface, the ape climbs 3 feet in a minute only to slip back 2 feet.

How much time do you think the monkey will take to reach the top of the pole?

What is in seasons, seconds, centuries and minutes but not in decades, years or days?

No one wants to have it, but if one got it, he does not want to lose it. What is It?

I start and end with 500 and carry a 5 in my heart. But I require the first letter and the first number to be complete. I am the name of a King.

Who am I ?

Can you place six matchsticks in a manner that each of the matchsticks is in touch with the other five matchsticks?