"of which " and "whose"

I am confused with the usage of "of which " and "whose".

I heard that "whose" is only used for humans and animals but things.

Also, it is out of fashion to use "of which " to mean possession.

I have no idea if the above is true.


Are these following sentences correct gramatically??

1, I have a cat called Johnny whose neck is extremely thick!! Correct or incorrect

2, I have a cat called Johnny, neck of which is extremely thick!!

3,I made an arrangement for shipment by airfreight whose estimated arrival date is tomorrow.

4,I made an arrangement for shipment by airfreight, estimated arrival date of which is tomorrow.

5, I saw a lady whose son is looks-alike for me.

6, I saw a lady, the son of which is look-alike for me.

7, I passed a house whose roof is moldy.

8, I passed a house, the roof of which is moldy.

I would be grateful if someone could tell me if those sentence are correct respectively,

if not, please give me a brief explanation.

Thank you in advance

Best wishes

Yoshi