first spectra from Top
Answer is
explanation: NMR has peak only in aromatic region in the given option only benzonitrile will have peak only in aromatic region whereas other option will have peak in aliphatic region also.
second spectra from top
Answer is
explantion: in aliphatic region two triplet and one mutiplet is due to n-propyl group and peak at aromatic region is due to phenyl group terefoe NMR spectra is belong n-propylbenzene
third spectra from top
Answer is CH3CN
explanation: the peak is slightly downfielded due to electron withdrawing nature of CN group. for benzene, CHCl3, CHCl2 will more downfielded singlet peak. for cyclohexane we will have upfielded singlet peak. therefore answer is CH3CN
fourth and fifth spectra from top
Answer is
explanation: the two triplet and one mutiplet is due n-propyl group. the triplet peak at 3.5 ppm is due to methylene group attached to oxygen
the singlet at around 2.1 ppm Is due to hydroxy group
therefore NMR belong to n-propanol
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