Can you find the odd number in the following?

2716, 4135, 5321 and 7145

A man is shown a portrait painting. He looks closely, then tells, “Brothers and sisters have I none, but that man’s father is my father’s son!” Who is the man in the portrait?

You are in a land where thirty men and two women were dressed in classic black and white dresses.
They begin to fight as soon as any of them move.

Where are you?

There was an aeroplane crash, every single person died, but two people survived. How is this possible?

What can you catch but never throw?

Twice ten are six of us,

Six are but three of us,

Nine are but four of us;

What can we possibly be?

Would you know more of us?

Twelve are but six of us,

Five are but four, do you see?

What are we?

What number do you get when you multiply all of the numbers on a telephone's number pad?

What part of the chicken has the most feathers?

what does this picture(rebus) riddle means ?

What always comes into a house through the keyhole?