3. a) How many signals does 1HNMR spectrum of the unknown have? b) What is the ratio between the numbers of different hydrogens in the compound? c) Explain the splitting pattern of all signals. d) Explain the chemical shifts of signals, based on the locations of hydrogens relative to the deshielding groups (if any) in the compound. Molecular Formula: C4H8O2 1. a) Calculate the IHD of your unknown (show all your calculations): b) What does the value of IHD indicate? 1 1HD= Maycontain ringordouble bond 1HD2 = Triple bond 2. a) Identify and explain the characteristic IR absorptions of your unknown, in 14004000cm1 range. The 13C NMR spectrum of ethyl acetate shows 4 signals, one for each nonequivalent C. It is composed b) What is the class (i.e., the functionat group) of your unknown compound? Explain. Structure =CH3CH2COOCH3 Group =E ster =RCOOR 3. a) How many signals does 'HNMR spectrum of the unknown have? b) What is the ratio between the numbers of different hydrogens in the compound? c) Explain the splitting pattern of all signals. d) Explain the chemical shifts of signals, based on the locations of hydrogens relative to the deshielding groups (if any) in the compound. 4. a) How many signals does 13CNMR spectrum of the unknown have? b) Explain the chemical shifts of signals, based on the locations of carbons relative to deshielding groups (if any) in the compound. 3 main signals: I singlet (01.833 atriplet@1.055ppm8 acetate at 4.2.4.7ppm The more hydrogen bonding there is the more deshielded the proton \& higher its chemical Shif towill be unknown and explain your conclusions. You can use the back of this page if you need more space. Attach all spectra with comments to this report