There are a couple of ways to determine the version of Oracle.
1) Run the following command, logged in as the oracle user, on the ACM appliance:
opatch lsinventory (note that that is a lowercase 'L' in lsinventory)
This returns the following information:
***********************************
Invoking OPatch 10.2.0.2.0
Oracle interim Patch Installer version 10.2.0.2.0
Copyright (c) 2005, Oracle Corporation. All rights reserved..
Oracle Home : /u01/app/oracle/product/10.2.0/db_1
Central Inventory : /home/oracle/oraInventory
from : /u01/app/oracle/product/10.2.0/db_1/oraInst.loc
OPatch version : 10.2.0.2.0
OUI version : 10.2.0.2.0
OUI location : /u01/app/oracle/product/10.2.0/db_1/oui
Log file location : /u01/app/oracle/product/10.2.0/db_1/cfgtoollogs/opatch/opatch-2008_Aug_25_18-50-09-EDT_Mon.log
Lsinventory Output file location : /u01/app/oracle/product/10.2.0/db_1/cfgtoollogs/opatch/lsinv/lsinventory-2008_Aug_25_18-50-09-EDT_Mon.txt
--------------------------------------------------------------------------------
Installed Top-level Products (2):
Oracle Database 10g 10.2.0.1.0
Oracle Database 10g Release 2 Patch Set 1 10.2.0.2.0
There are 2 products installed in this Oracle Home.
Interim patches (1) :
Patch 4689959 : applied on Mon Jun 02 14:18:43 EDT 2008
Created on 17 Oct 2006, 03:22:48 hrs US/Pacific
Bugs fixed:
4689959
--------------------------------------------------------------------------------
OPatch succeeded.
2) Another 'quick' way to determine the Oracle version is to run sqlplus, and note the version #
$ sqlplus
SQL*Plus: Release 10.2.0.2.0 - Production on Thu Sep 24 22:42:39 2009
Copyright (c) 1982, 2005, Oracle. All Rights Reserved.
3) Another 'quick' way is to look for the word Version in the Oracle Instance Alert log file:
$ grep Version /u01/app/oracle/product/admin/AVDB/bdump/alert_AVDB.log
Starting up ORACLE RDBMS Version: 10.2.0.2.0.
| 
on Jun 14, 2016