By Noel Randewich and Sruthi Ramakrishnan SAN FRANCISCO (Reuters) – Qualcomm Inc, the worlds biggest maker of cellphone chips, unexpectedly named Chief Operating Officer Steve Mollenkopf as chief executive on Friday, heading off the possibility he might be poached to run Microsoft Corp. Mollenkopf had been in line to eventually succeed CEO Paul Jacobs, the 51-year-old son of a Qualcomm co-founder, but that plan was sped up in order to keep the senior executive from leaving, Jacobs told Reuters in an interview. Our executives are very talented and very sought after, Jacobs said, when asked by Reuters whether the promotion was related to an offer from Microsoft. Jacobs and Mollenkopf declined to specifically discuss Microsoft or whether Mollenkopf had a job offer from the worlds largest software company, which is seeking a candidate to replace retiring CEO Steve Ballmer.