is this correct to sttop a bot whchis running

Official Hardware Mega Due
1

int motor_1_terminal_1 = 5;
int motor_1_terminal_2 = 6;
int motor_2_terminal_1 = 10;
int motor_2_terminal_2 = 11;
i
void setup()
{ Serial.begin(9600);
pinMode(motor_1_terminal_1, OUTPUT);
pinMode(motor_1_terminal_2, OUTPUT);
pinMode(motor_2_terminal_1, OUTPUT);
pinMode(motor_2_terminal_2, OUTPUT);
attachInterrupt(2,stopmotor,CHANGE);
}
void stopmotor()
{
analogWrite(motor_1_terminal_1,0);
analogWrite(motor_1_terminal_2,0);
analogWrite(motor_2_terminal_1,0);
analogWrite(motor_2_terminal_2,0);
}
void loop()
{
analogWrite(motor_1_terminal_1,255);
analogWrite(motor_1_terminal_2,0);
analogWrite(motor_2_terminal_1,255);
analogWrite(motor_2_terminal_2,0);
delay(1000);
analogWrite(motor_1_terminal_1,0);
analogWrite(motor_1_terminal_2,255);
analogWrite(motor_2_terminal_1,0);
analogWrite(motor_2_terminal_2,233);
delay(1000);
}

2

Impossible to say, since you haven't said anything about the hardware those terminals are connected to.

3 
attachInterrupt(2,stopmotor,CHANGE);

Depending on your board, you may want to check the precise documentation for that function carefully.

Regardless of your board, you will want to start using code tags.

4

im using arduni due.. i am using ir sensor for it]

5

nothinghere:
im using arduni due.. i am using ir sensor for it]

Try harder it is still way too vague.