What does below chemistry rebus means?

A man started to town with a fox, a goose, and a sack of corn. He came to a stream which he had to cross in a tiny boat. He could only take one across at a time. He could not leave the fox alone with the goose or the goose alone with the corn. How did he get them all safely over the stream?

I have lakes with no water, mountains with no stone and cities with no buildings. What am I?

A person was killed at a house party. When the police arrive, there are six people present in the house who are the friends of the victim. The name of the friends is Rohit, Aman, Nick, Gagan, and Randy.

Near the dead body, they find a few numbers written with blood by the victim on the floor. The numbers are 8, 5, 4, and 11.

The police arrests one of the friends for the murder. Whom did they arrest and why?

There is a shop where written:
Buy 1 for $1
10 for $2
100 for $3
I needed 999 and still only paid $3. How could this be financially viable for the shop-keeper?

Irene killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

What does this rebus photo means?

In the given picture, in how many ways can you read the word "Tiger"?

What is 3/7 chicken, 2/3 cat and 2/4 goat?

You can move only two matchsticks in the given picture. What is the highest number you can form by doing it?