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April 27 2014 — Specifiying "be"

 

Is this correct?

southern Indian Ocean route

Steve Jobs directed the development and design of several new devices one of which the iPhone is.

 

Select one or more options to read the feedback.

 

1.

Why?

Steve Jobs directed the development and design of several new devices one of which the iPhone is.

2.

Why?

Steve Jobs directed the development and design of several new devices one of which is the iPhone.

* marks awkward usage

awkward (Adj) – bad, not smooth, not graceful

Note that the object of the quantity phrase "one of them" modifies "devices"; therefore, we cannot simplify "one of which" to just "which".