Propane to electric

Hi,

I am redmodeling my kitchen where I have a propane gas range. The flexible copper tubing comes throught the floor to feed the range, for some reason there was never a shutoff valve installed; not good. I need to cap of the line before I can do any more work on the kitchen. I bought a flare cap to put on the brass 90 degree elbow that is attached to the flex copper coming up through the floor. Will this work? Do I need to use a copper washer or bonnet with the flare cap to get a good seal?

I am going to buy an electric range, so I don't really need the gas line anymore. Should I cap it off a the tee in the basement instead of in the kitchen?

Any help appreciated...

do in the basement

their are a number of ways I can think of that can be done in the basement, I would not just t a flare cap in the kitchen...

replacing the tee makes sense...no capped ends that way

thanks