Now assuming you mean iOS 7, the iPhone 4, 4S and 5 will get it along with the two new iPhones coming out which are the iPhone 5C and 5S.
Yes
No, it is Android OS only. No similar app exists for iOS.
Yes
Well Android is the operating system, but the phone you'd get with the new OS would indeed be a touch screen. Much like Apple only releases touchscreen iPhones.
There are many stores that sell new iPhones. Many AT&T stores have a wide selection of iPhones to choose from, as well as Apple stores. They can also be found at Walmart.
A proprietary OS is like Apple's MacOS for their computers and the iOS for their iPhones, and iPads or Microsofts Windows OS for examples. They have complete control over who can use it and how they use it. No one else is allowed to make any version of them, etc.
It really depends on your opinion of witch one you like better.
No, that is a computer operating system, iPhones use an iOS which is a completely different language but similar features.
It depends on the phone. Droids use the Android operating system, however iPhones use a different OS.
Yes, Google Chrome is compatible with Apple. It can be run on OS X easily as prepared by the developers.
iOS is made by apple for they iphones and stand for "Iphone OS" and is not used in computer programming... see related links for more info about iOS
Older versions used a processor called PowerPC made by power.org New versions use Intel.