EXHIBIT 5









                                                   October 21, 1997






Board of Directors
Union Carbide Corporation
39 Old Ridgebury Road
Danbury, CT  06817-0001


            Re:  Registration Statement on Form S-8
                 for 1997 Union Carbide
                 Long-Term Incentive Plan
                 ----------------------------------

Dear Sirs:

            We are acting as counsel to Union  Carbide  Corporation,  a New York
corporation ("Corporation"),  in connection with the preparation and filing of a
Registration  Statement  on Form S-8 (the  "Registration  Statement")  under the
Securities  Act of 1933, as amended,  ("Act") with the  Securities  and Exchange
Commission  ("Commission")  relating to the  registration of 6,000,000 shares of
common stock, $1.00 par value per share (the "Common Stock"), of the Corporation
offered for sale pursuant to the 1997 Union  Carbide  Long-Term  Incentive  Plan
(the "Plan").

            In  connection  with the opinion,  we have examined and are familiar
with originals or copies, certified or otherwise identified to our satisfaction,
of such  documents,  corporate  records,  certificates  of public  officials and
officers  of the  Corporation  and  such  other  instruments  as we have  deemed
necessary or appropriate as a basis for the opinions expressed below.

            For purposes of this opinion we have assumed the authenticity of all
documents  submitted  to us as  originals,  the  conformity  to originals of all
documents






Board of Directors
 Union Carbide Corporation          -2-                    October 21, 1997


submitted to us as certified or photostatic  copies, and the authenticity of the
originals of all documents  submitted to us as copies.  We have also assumed the
legal capacity of all natural persons,  the genuineness of all signatures on all
documents examined by us, the authority of such persons signing on behalf of the
parties thereto other than the Corporation and the due authorization,  execution
and delivery of all documents by the parties thereto other than the Corporation.
As to certain factual matters material to the opinion  expressed herein, we have
relied to the  extent we deemed  proper  upon  representations,  warranties  and
statements  as  to  matters  of  officers  and  other   representatives  of  the
Corporation. Our opinion expressed below is subject to the qualification that we
express  no  opinion  as to any law other than the laws of the State of New York
and the federal  laws of the United  States of  America.  Without  limiting  the
foregoing,  we express no opinion with respect to the  applicability  thereto or
effect of municipal  laws or the rules,  regulations  or orders of any municipal
agencies within any such state.

            Based upon the foregoing, we are of the opinion that:

            1. The Corporation  has  been duly organized and is validly existing
under the laws of the State of New York.

            2. The  Plan  has been duly adopted by the Board of Directors of the
Corporation and approved by the shareholders of the Corporation.

            3. The  shares  of  Common  Stock of the  Corporation  to which  the
Registration  Statement  relates  have been duly  authorized  and  reserved  for
issuance  pursuant to the Plan and,  when issued and sold  pursuant to the Plan,
will be legally issued, fully paid and non-assessable.

            This opinion is limited to the specific issues addressed herein, and
no opinion may be inferred or implied  beyond that expressly  stated herein.  We
assume no  obligation to revise or  supplement  this opinion  should the present
laws of the  State of New  York or the  federal  laws of the  United  States  of
America be changed by legislative action, judicial decision or otherwise.

            We hereby  consent to the  filing of this  letter as an Exhibit 5 to
the Registration  Statement. In giving such consent, we do not admit that we are
in the category of persons whose consent is required  under Section 7 of the Act
or the rules and regulations of the Commission promulgated thereunder.








Board of Directors
 Union Carbide Corporation          -3-                    October 21, 1997


            This opinion is furnished  to you in  connection  with the filing of
the  Registration  Statement  and is  not  to be  used,  circulated,  quoted  or
otherwise relied upon for any other purpose.

                             Very truly yours,

                             KELLEY DRYE & WARREN LLP