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In 13C-NMR,the amount of hydrogen attached to each carbon can be determined by observing the spectrum...

In 13C-NMR,the amount of hydrogen attached to each carbon can be determined by observing the spectrum of?
1. broad band decoupled
2. off resonance decoupled
3. COSY
4. DEPT

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Answer #1

A)The information on number of hydrogens attached to each carbon can be obtained from C 13 by

OFF RESONANCE DECOUPLED SPECTRA in which multiplicities by coupling with neighbouring protons are observed.

B)In broadband decoupled spectra ,only singlets are observed for different types of carbons in the compound

C)Cosy is correlated spectroscopy and in this correlations between 1H - 1H or 13C - 1H are observed .

D) DEPT spectras are taken on 90 degrees and 135 degrees...

In 135 degrees, methine carbons and methyl carbons are up and methylene carbons are down.

Thus, the answer is (2).

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