The nuclei you think is invisible in NMR spectroscopy is:
Correct answer: A. N14
- A. N14
- B. P31
- C. Cl35
- D. C13
Explanation
NMR spectroscopy requires nuclei with non-zero spin to be detected. Cl³⁵ has a quadrupolar nucleus with spin 3/2 and often gives broad, weak, or undetectable signals, making it practically "invisible" in routine NMR. Nuclei like C¹³, H¹, N¹⁴, and P³¹ are commonly detectable.
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About Analytical Chemistry
Analytical chemistry identifies and measures substances using separation and instrumental methods. Chromatography is studied through stationary and mobile phases, retention and Rf values, while spectroscopy connects absorption of electromagnetic radiation with molecular structure and supports qualitative and quantitative analysis through techniques such as UV-visible and infrared spectroscopy.
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