CH1012
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D2O EXCHANGE
Deuterium (D) is an isotope (1p, 1n) of hydrogen with a different spin value (I = 1). 
• D may be used when we want to substitute an H atom in a molecule & then observe the absence of the H signal in a NMR spectrum.
• D2O is the deutero analogue of H2O and it may be used to identify OH & NH protons in an NMR spectrum.
    the R-O-H signal “disappears”
• CDCl3 is the deutero analogue of CHCl3.
Again the 2D of the solvent is not  observed
when we are measuring 1H NMR spectra.