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Shabir ahmad bhat Best Answer
in P NMR, the phosphorous signal will be splitted by three equivalent protons having nuclear spin = 1/2 into quartet. the intensity of quartet will be as per pascal triangle as 1:3:3:1. However, in case of H NMR, the signal of three equivalent protons will be splitted by single Phosphorus atom with nuclear spin = 1/2 into doublet. the intensity Will be 1:1.