Question

Taprofen HO 1 Houl many sets of non-tquivalent protons.are prcaent? 2Picasc label all protons in the Structure and indicate what Ould oe the multiplicity of each sct of non-equi valent proton (singlet, doublcf, etc.? 3, Hou many peaks uauld you precdict ulould appear in the Carbon-13 NHR Spectrum? Please labelall car bons 4. Pich at laast 2 functional groups and cesctibe uherc they vlald appecir in the IR Spectrum

Answer 1

The number of signals in 1H NMR spectrum is equal to the number of different chemical environment protons present in the compound.

Splitting takes place according to N+1 rule.

Here N is number of hydrogen atoms attached to the adjacent carbon atom.

If N = 0 singlet
If N =1 doublet
If N = 2 triplet
If N = 3 quartet
If N = 4 pentet
If N = 5 sextet

cili e 1439 20-H 30 O Number of fel- of ns-huivalent porotons - B a 6H - doublet Citi) Nonet (8+1) doublet CI+). dmah ~ douslet 6+1) et 2h doublet Citid 14 quantel- (3+1) 9 - 3H. doublet- Citoy n a TH Singlet Cotil Ï Ï Ï ī C 13C-NMR a Nunth d pelas 13 conmp - 110 • a 6 IR cenboxylic Aida -OH → Broad peek at 3200-2500 EC- H -C-4 c=c 3020-3100 cm 2900-2950 am s. 1450-1600 unt (Aromatic)