2007 Other Jeep Models Replace all 4 wheels?

Hi

Jeep Compass--model--automatic and as cheap as you can get.

I had what I thought was a slow leak in the rear passenger wheel. Took it to a tire shop this morning and was told the tire was not repairable and that I needed a new one. He then said because I have an all-wheel drive vehicle I had to replace all 4. When I bought my Jeep, I was told it was front-wheel drive and I had to switch it into 4 wheel drive which I do may 5 days a year when it snows.

We argued and he said I had a system that when the front tires slipped, power would go to the rear tires--I don't recall getting this feature and I understand it was extra.

So, is this guy blowing smoke up my a**?