EXHIBIT 99(d)

                           CONSENT OF EUGENE A. RENNA

     I hereby consent to being named as a person who will become a director of
Exxon Corporation, a New Jersey corporation ("Exxon"), in connection with the
consummation of the merger (the "Merger") contemplated by the Agreement and Plan
of Merger, dated as of December 1, 1998, among Exxon, Mobil Corporation, a
Delaware corporation, and Lion Acquisition Subsidiary Corporation, a Delaware
corporation, in the Registration Statement on Form S-4 to be filed by Exxon with
the Securities and Exchange Commission in connection with the Merger (the
"Registration Statement"), and to the filing of this consent as an exhibit to
the Registration Statement.

Signature: /s/ Eugene A. Renna
           ---------------------
           Eugene A. Renna

Date: March 24, 1999