Question

The type(s) of chemically non-equivalent protons present in the following molecule is _ _ _. (answer in integer)

Hint:

While counting chemically non-equivalent protons, first identify symmetry-related groupsSymmetry-related protons give the same NMR signal

Answer 1

Correct Answer: 2

Step 1: Use molecular symmetry.
Protons related by symmetry give the same signal.

Step 2: Group the protons.
All the methyl protons are equivalent by symmetry, and all the cage ring protons are equivalent to each other.

Step 3: Count the types.
That leaves two kinds of non-equivalent protons.

Step 4: Answer.
\[ \boxed{2} \]