Which of the following statements about NMR spectroscopy is

Which of the following statements about NMR spectroscopy is correct and most complete? (Hint: Be careful.) (A) 1C NMR spectroscopy is the second most common NMR spectroscopy in organic chemistry after H NMR (B) cyclohexane has two signals in its NMR spectrum at room temperature, one corresponding to its axial hydrogens and one to its equatorial hydrogens (C) the NMR sp (S,s)-trans-1,2-dimethylcyclohexane will be identical in CDCl3 (D) all of the above statements are true

Solution

Answer: C) is the correct answer.

explaination: for A: 12C nmr is given but 13C nmr is correct but not 12C nmr.

explaination for B: cyclohexane axial and equitorial hydrogens are separated at -100 deg c only. here two signals observed but at room tempearture only one signal observed.that means not separated axial and equitorial hydrogens

explaination for C: Here (R,R) and( S,S) these two enentiomers so will be identical.