Sure, here are the binary tree questions along with their LeetCode links:

### Easy

1. Binary Tree Inorder Traversal: https://leetcode.com/problems/binary-tree-inorder-traversal/

2. Binary Tree Preorder Traversal: https://leetcode.com/problems/binary-tree-preorder-traversal/

3. Binary Tree Postorder Traversal: https://leetcode.com/problems/binary-tree-postorder-traversal/

4. Maximum Depth of Binary Tree: https://leetcode.com/problems/maximum-depth-of-binary-tree/

5. Symmetric Tree: https://leetcode.com/problems/symmetric-tree/

6. Path Sum: https://leetcode.com/problems/path-sum/

7. Invert Binary Tree: https://leetcode.com/problems/invert-binary-tree/

8. Diameter of Binary Tree: https://leetcode.com/problems/diameter-of-binary-tree/

9. Balanced Binary Tree: https://leetcode.com/problems/balanced-binary-tree/

10. Lowest Common Ancestor of a Binary Search Tree: https://leetcode.com/problems/lowest-common-ancestor-of-a-binary-search-tree/

11. Same Tree: https://leetcode.com/problems/same-tree/

### Medium

1. Binary Tree Level Order Traversal: https://leetcode.com/problems/binary-tree-level-order-traversal/

2. Binary Tree Right Side View: https://leetcode.com/problems/binary-tree-right-side-view/

3. Construct Binary Tree from Preorder and Inorder Traversal: https://leetcode.com/problems/construct-binary-tree-from-preorder-and-inorder-traversal/

4. Construct Binary Tree from Inorder and Postorder Traversal: https://leetcode.com/problems/construct-binary-tree-from-inorder-and-postorder-traversal/

5. Binary Tree Zigzag Level Order Traversal: https://leetcode.com/problems/binary-tree-zigzag-level-order-traversal/

6. Sum Root to Leaf Numbers: https://leetcode.com/problems/sum-root-to-leaf-numbers/ 

7. Flatten Binary Tree to Linked List: https://leetcode.com/problems/flatten-binary-tree-to-linked-list/

8. Binary Tree Maximum Path Sum: https://leetcode.com/problems/binary-tree-maximum-path-sum/

9. Find Bottom Left Tree Value: https://leetcode.com/problems/find-bottom-left-tree-value/

10. Lowest Common Ancestor of a Binary Tree: https://leetcode.com/problems/lowest-common-ancestor-of-a-binary-tree/

### Hard

1. Serialize and Deserialize Binary Tree: https://leetcode.com/problems/serialize-and-deserialize-binary-tree/

2. Recover Binary Search Tree: https://leetcode.com/problems/recover-binary-search-tree/

3. Binary Tree Cameras: https://leetcode.com/problems/binary-tree-cameras/

4. Binary Tree Maximum Path Sum II: https://leetcode.com/problems/binary-tree-maximum-path-sum-ii/ (Note: LeetCode does not have this exact problem; consider practicing asimilar problem like [Binary Tree Maximum Path Sum](https://leetcode.com/problems/binary-tree-maximum-path-sum/))

5. Vertical Order Traversal of a Binary Tree: https://leetcode.com/problems/vertical-order-traversal-of-a-binary-tree/

6. All Nodes Distance K in Binary Tree: https://leetcode.com/problems/all-nodes-distance-k-in-binary-tree/

7. Sum of Distances in Tree: https://leetcode.com/problems/sum-of-distances-in-tree/

8. Count Complete Tree Nodes: https://leetcode.com/problems/count-complete-tree-nodes/

9. Kth Smallest Element in a BST: https://leetcode.com/problems/kth-smallest-element-in-a-bst/

10. Smallest Subtree with All the Deepest Nodes: https://leetcode.com/problems/smallest-subtree-with-all-the-deepest-nodes/


### Very Hard (by Akash Bansal):