Depends on the state.
It is not legal to carry open liquor in CA either walking or in a car. If you bought a bottle of wine at a wine shop you could carry it around in the bag unopened.
It is not illegal to drink alcohol in cars in Victoria. It is illegal to drive a car in Victoria with a blood/alcohol content of 0.05% or higher.
Yes but you cant drink it
If it is legal for you to have possession of both a car and alcohol, then yes it is legal to have alcohol in the trunk of your car.
Only if you have a legal license
yes it is legal
An alcolock is a mechanism which prevents a car from starting if the driver of the car has exceeded the legal limits of alcohol consumption.
When it's denatured rubbing alcohol not intended for human consumption, or when an of-age person is in the vehicle with them.
No, regardless of wether its open or not you are a minor and it is still alcohol.
It depends on the state, in VA, you can buy cigarettes/fireworks/guns/pornagraphy/lottery ticket, you are allowed to carry but not consume alcohol, you may drive with as many people as you want in your car, you may vote
You will need to consult with a lawyer for a legal and correct answer.
You local police can tell you under what circumstances it is legal to do so.