Q5 · CSIR NET Chemistry, December 2012
Paper: CSIR NET December 2012 · Subject: Inorganic Chemistry · Chapter: Inorganic Spectroscopy · Topic: Inorganic Spectroscopy – General · Marks: 2 · Difficulty: Medium
Find out the number of lines in the ${}^{31}\mathrm{P}$ NMR signal for diagram 
(a)3
(b)6
(c)18
(d)90
Answer
Answer: D ✓ checked by 4AB · confidence high
Explanation
³¹P couples to the P–H (doublet), two ¹⁹F (triplet), two ¹⁵N (I = ½, triplet) and four N–H protons (quintet): 2 × 3 × 3 × 5 = 90 lines (d).
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