Which Number is the odd one out?

A) 7145
B) 2716
C) 5321
D) 4135

You have to fill the below given grid in a manner that every row and column contains the digits 1 to 6. Also, make sure that the squares that are connected with each other must contains the same digit.

What runs around the whole yard without moving?

I am a type of food that is often found in the fridge and can be white in colour. What I am?
Hint 1: I am a dairy product.
Hint 2: You can spread me on the bread.

There is something which you can be arrested for attempting but not for successfully completing.

You’ll find me on Mercury, Earth, Mars, Jupiter, Saturn, and Uranus. But never Neptune, or Venus. What am I?

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see? What is it?

Ten coins have been arranged as you can see in the given picture. In this arrangement, a triangle is formed pointing upwards. You have to invert the position of the triangle and make it point downwards while changing the position of 3 coins only. Can you do it?

Why is a river so rich ?

They came out at night, without being called.
They lost at day, without being stolen.
Who are they?