Dns bind not working nslookup gives servfail

I am connected to a reliance wifi connection obtained a 192.168.0.101 ip. 192.168.0.1 as primary dns. I configured dns bind to give name to my server process. To test that locally i changed the dhclient.conf "prepend domain-name-servers 127.0.0.1;" so that my resolv.conf changed to namserver 127.0.0.1. and my primary dns changed to 127.0.0.1

ashokkrishna@krishna:~$ nslookup group.hom
Server:     127.0.0.1
Address:    127.0.0.1#53

** server can't find group.hom: SERVFAIL

and the config file

ashokkrishna@krishna:/etc/bind$ cat named.conf.local
# Our domain zone
zone "group.hom" {
   type master;
   file "/etc/bind/zones/group.hom.db";
};

# For reverse DNS 
zone "0.168.192.in-addr.arpa" {
   type master;
   file "/etc/bind/zones/rev.0.168.192.in-addr.arpa";
};

the forward zone file.

ashokkrishna@krishna:/etc/bind/zones$ cat group.hom.db
;
; BIND data file for local loopback interface
;
$TTL    604800
@   IN  SOA i.group.hom. root.group.hom. (
                  2     ; Serial
             604800     ; Refresh
              86400     ; Retry
            2419200     ; Expire
             604800 )   ; Negative Cache TTL
;
@   IN  NS  group.hom.
@   IN  A   192.168.0.101
www     IN  A       192.168.0.101

reverse zone

ashokkrishna@krishna:/etc/bind/zones$ cat rev.0.168.192.in-addr.arpa
;
; BIND data file for local loopback interface
;
$TTL    604800
@   IN  SOA i.group.hom. root.group.hom. (
                  2     ; Serial
             604800     ; Refresh
              86400     ; Retry
            2419200     ; Expire
             604800 )   ; Negative Cache TTL
;
@   IN  NS  group.hom.
101.0.168   IN  PTR group.hom.

/etc/hosts

ashokkrishna@krishna:/etc/bind/zones$ cat /etc/hosts
127.0.0.1   localhost
127.0.0.1      krishna
192.168.0.101       i.group.hom    i

named.conf.options

dnssec-validation auto;

    auth-nxdomain no;    # conform to RFC1035
    listen-on-v6 { any; };
};

why i am getting this error? bind successfully running but it is not giving the name to my system. its not connecting why.?

new zone database:

;
; BIND data file for local loopback interface
;
$TTL    604800
@   IN  SOA ib.group.hom. root.group.hom. (
                  2     ; Serial
             604800     ; Refresh
              86400     ; Retry
            2419200     ; Expire
             604800 )   ; Negative Cache TTL
;
@   IN  NS  group.hom.
group.hom.    IN    A    192.168.0.101
@   IN  A   192.168.0.101
www     IN  A       192.168.0.101