James A. Morakis, public affairs manager for Exxon Company International, the Exxon subsidiary for overseas operations, said company workers would be staffing telephones around the clock to receive information about Mr. Reso's whereabouts.

On December 28, 1967, the land was sold to the joint venture between King Ranch and the Friendswood Development Company, an Exxon subsidiary.

The Exxon subsidiary that owns the tanker, challenging the 1990 Federal law that in the animus of the moment prohibited her from ever returning to Alaska, has been seeking permission in both Congress and the courts for her once again to work the waters of Prince William Sound.

LEAD: Rebels dressed in army uniforms burned three trucks loaded with chemicals destined for an Exxon subsidiary, causing $250,000 in damage, the police said today.

Under the merger agreement, an Exxon subsidiary would merge into Mobil so that Mobil becomes a wholly owned subsidiary of Exxon Mobil.

Seven of the nine experts left Exxon subsidiaries and affiliates in 1986 during an industrywide slump, when Exxon and other oil companies offered workers incentives to retire in an effort to reduce their work forces, Mr. Golob said.

"If you were young and single and upwardly mobile in the 1970's, you lived in a Farb," said Liz Dantone, a project manager for the Friendswood Development Company, a former Exxon subsidiary that has built several residential communities around Houston.

A Federal criminal case against executives of the Exxon Shipping Company, an Exxon subsidiary, is still pending; there was no word today on how the proposed settlement would affect that case.

But what immediately precipitated his downfall was his attempt to settle a long-running dispute with the International Petroleum Company, an Exxon subsidiary - an attempt denounced by the head of the Peruvian national oil company as a surrender of national wealth to foreigners.