NUMERICAL PROBLEM OF NMR
Q-1. Proton that have resonance at 110 Hz Downfield from TMS on nmr spectrophotometers it’s operates at 50Hz so, calculated the chemical shift ?
Q.2 If the observed shift from TMS is 500Hz and operated frequency of the instrument is 200MHz calculated the chemical shift ?
Ans. 2.5 PPM
Q.3 1,2 bromide Ethan shows how many signal show in NMR spectra ?
Ans. 1 nmr signal
Q.4 acetic acid show how many signal in NMR spectra ?
Ans. 2 nmr signal
IR NUMERICAL problem
Q.1 calculated the stretching vibration for C-H bond ?
Q.2 write the various infra-red band in the case of TOLUENE ?
ANS. Ar- stretching -3030 cm¯¹
C-H stretching in CH3 – 2850- 2960cm¯¹
C=C stretching 1600cm¯¹
C-H bending for monosubstituted to benzene =730-770cm¯¹
Q.3 write the various infra-red band of 2-Hexene ?
Ans. C-H str. In alkenenes – 3050 cm¯¹
C-H str. Im CH2-CH3 – 2860 -2950 cm¯¹
C=C str. – 1680 cm¯1
C-H bending 1460 cm¯¹
-C-H=CH2 (cis-trans) -700-970cm¯¹
Reference take Y R Sharma book page no. 106 to 110 and 197 to 200