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5. In proton NMR, 'H-' H spin-spin-splitting is common. Why is there no comparable "7C." C spin-spin splitting in C-13 NMR? A. C-13 has a nuclear spin of zero. B. The probability of two C-13 nuclei being next to each other in a compound is very low. C. The coupling constant is very small - too small to be observed. D. There is 13 C. C spin-spin splitting but because of the complex splitting patterns decoupling techniques are used to suppress it. E. None of the above 6. Identify which one of the following isomers of Ce​H14​ has the C−13NMR below. A. CH3​CH2​CH2​CH2​CH2​CH3​ B. (CH3​)2​CHCH(CH2​)2​ C. CH3​CH2​CH2​CH(CH3​)2​2​ D. CH3​CH2​C(CH3​)3​ E. None of the above 7. Which compound with molecular formula of C4​H3​C would give the ' H NMR shown below?