Teaching CSIR NET Mock Test Series Chemical Sciences Structure Determination of Organic Compounds 1h NMR and 13c NMR Spectroscopy
In a proton decoupled 13C NMR of a compound, number of carbons in each signal cannot be calculated from the integration because signal intensities get affected by
i. NOE induced by attached protons
ii. different relaxation times of different carbons
iii. poor isotopic abundance of 13C
1
Only ii
2
Both i and iii
3
Both ii and iii
4
Both i and ii