i have not completely checked the code but seems OK
but the thing is there may be or can be some unknown errors
the proper handshaking may not be happning between 89C51 and 24C02
this can happen because 8051 does not have built in IIC interface. we have to develop using program
that is why for IIC based devices like EEPROM, RTC, temperature sensors always choose/use micro controller with built in IIC interface like AVR or PIC or ARM