Can you find the odd number in the following?

2716, 4135, 5321 and 7145

I travel all around the world but always stay in the corner. What am I?

Find the smallest sentence with all the English alphabet.

What Deficiency does the below rebus represent?

VIT_MIN

What number does the below three word/phrase identify and why?
1. Deck
2. Year
3. Singing in the Rain

You board a train. The train will have to enter a tunnel soon. You are claustrophobic. Which place is the best for you to sit?

There are four 3-link chains. All you have to do is join them into a big 12-link chain. For joining two closed links, one of the links must be cut and placed onto the other link for closing.

How many minimum links will you have to cut to make the big chain?

Can you fill the blank with the correct number?

6 30 870 756030 _____

Can you find the six hidden animals in the picture below?

When I got four, I have it none.
When I got two, I have it some.
When I got none, I have it all.

What is it?