Major 11 Arpeggio

The following diagram shows a common fingering for the C Major 11 Arpeggio

Note: Even though the Major 11 is a theoretical possibility, it is often avoided as a chord due to the clash between the major 3rd and perfect 11th (4th). The #11 is a more common extension of the Major 7. 

Intervallic Construction: 1 3 5 7 9 11
Chord Symbols (on C): Cmaj11, CΔ11