Need suggestion on single supply rail to rail op-amp to use with arduino uno?

Using Arduino General Electronics
3
  1. Rail to rail mean, +ve to -ve voltage right?
  2. If I want Gnd to +Vcc, can it be rail to rail?
  3. I want to use gnd and +Vcc using a single supply battery, so whats the best option?
  4. I want a single supply so that I can use gnd and +ve and bias in the positive region. So that the minimum would be 0V and maximum would be +Vcc.
  5. I want an op-amp that can give me closest to +Vcc in this configuration.