Storyboard apps also run on pre-iOS 5 devices?

Question

If an app is developed using Storyboard in Xcode 4.2, can this app run in iOS 4.x devices?

Answer 1

No, it can't. Storyboards are only available in iOS 5.

From the UIStoryboard class reference:

Available in iOS 5.0 and later

From Converting to Storyboards Release Notes:

Storyboarding is a new way to create user interfaces for iOS applications, beginning with iOS 5 and Xcode 4.2.