NUMERICAL PROBLEM OF NMR AND Infrared Spectroscopy MCQ

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 ?

Ans. 

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