For ques 2:

./*Function to print level order traversal of tree*/
printLevelorder(tree)
for d = 1 to height(tree)
  {
      printGivenLevel(tree, d);
      printf(" %d\n",d);
  }

/*Function to print all nodes at a given level*/
printGivenLevel(tree, level)
if tree is NULL then return;
if level is 1, then
    print(tree->data);
else if level greater than 1, then
    printGivenLevel(tree->left, level-1);
    printGivenLevel(tree->right, level-1);

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