Here is the list of 26 parameters deprecated in  12.1.0.1c

SQL>SELECT name from v$parameter WHERE isdeprecated = ‘TRUE’ ORDER BY name;

NAME
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active_instance_count
background_dump_dest
buffer_pool_keep
buffer_pool_recycle
commit_write
cursor_space_for_time
fast_start_io_target
global_context_pool_size
instance_groups
lock_name_space
log_archive_local_first
log_archive_start
max_enabled_roles
parallel_automatic_tuning
parallel_io_cap_enabled
parallel_server
parallel_server_instances
plsql_debug
plsql_v2_compatibility
remote_os_authent
resource_manager_cpu_allocation
sec_case_sensitive_logon
serial_reuse
sql_trace
standby_archive_dest
user_dump_dest

26 rows selected.

References: Oracle Documentation

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Documented Parameters in 12c
Undocumented Parameters in 12c

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