Hey, @Shilpa,
What did you set the ownership to for the version-2 folder and contents? It should be zookeeper:hadoop and zookeeper (owner) should have write permissions. Did you also check that you can traverse the folder structure, as the zookeeper user?
Ex does this work;
[root@host]# su - zookeeper
[zookeeper@host ~]$ cd /data/hadoop/zookeeper/version-2/
[zookeeper@host version-2]$ ls -al
drwxr-xr-x. 2 zookeeper hadoop 4096 Aug 27 08:03 .
drwxr-xr-x. 3 zookeeper hadoop 4096 Aug 27 08:03 ..
-rw-r--r--. 1 zookeeper hadoop 1 Aug 27 08:03 acceptedEpoch
-rw-r--r--. 1 zookeeper hadoop 1 Aug 27 08:03 currentEpoch
-rw-r--r--. 1 zookeeper hadoop 67108880 Aug 28 10:52 log.100000001
-rw-r--r--. 1 zookeeper hadoop 296 Aug 27 08:03 snapshot.0