Which Number is the odd one out?

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

Which is the rope you never skip with?

I have a clock(12-hour format) and both the needles of the clock overlap at 12:00.
After how much time, they will overlap again?

You order chicken wings at KFC in the boxes of 6, 9 and 20. What is the largest number of wings that you cannot obtain by buying in any combination of the boxes?

A man has to get a fox, a chicken, and a sack of corn across a river.

He has a rowboat, and it can only carry him and one other thing.
If the fox and the chicken are left together, the fox will eat the chicken.
If the chicken and the corn are left together, the chicken will eat the corn.

How does the man do it?

What seven-letter word has hundreds of letters in it?

What does below chemistry rebus means?

Can you find out which number multiplied by itself will give the output as 12345678987654321?

Can you solve the tricky chess rebus puzzle below by ciphering the hidden meaning?

A Scientist was fifty years old in the year 2000 but he was forty years old in the year 2010. How can this be possible?

PS: It has a logical answer.