C program for Insertion sort and solve the tracing for any 2 example elements on your own.

Sure, here is a simple implementation of Insertion Sort in C:

#include <stdio.h>

void insertionSort(int arr[], int n) {
   int i, key, j;
   for (i = 1; i < n; i++) {
       key = arr[i];
       j = i - 1;

       while (j >= 0 && arr[j] > key) {
           arr[j + 1] = arr[j];
           j = j - 1;
       }
       arr[j + 1] = key;
   }
}

void printArray(int arr[], int n) {
   int i;
   for (i = 0; i < n; i++)
       printf("%d ", arr[i]);
   printf("\n");
}

int main() {
   int arr[] = {12, 11, 13, 5, 6};
   int n = sizeof(arr) / sizeof(arr[0]);

   insertionSort(arr, n);
   printArray(arr, n);

   return 0;
}

Now, let's trace the sorting process for the first two elements of the array {12, 11, 13, 5, 6}:

1. In the first iteration, i = 1, key = arr[1] = 11, and j = i - 1 = 0. Since arr[j] = 12 is greater than key = 11, we move arr[j] to arr[j + 1], resulting in the array {12, 12, 13, 5, 6}. Then we decrease j by 1 to -1. Since j is no longer >= 0, we exit the while loop and set arr[j + 1] = key, resulting in the array {11, 12, 13, 5, 6}.

2. In the second iteration, i = 2, key = arr[2] = 13, and j = i - 1 = 1. Since arr[j] = 12 is not greater than key = 13, we do not enter the while loop and directly set arr[j + 1] = key. The array remains {11, 12, 13, 5, 6}.

The rest of the array would be sorted in the subsequent iterations.