8- Wh ich of the following methyl groups will have the most downfield signal? I

Question

8- Wh ich of the following methyl groups will have the most downfield signal? I 9. In an NMR spectrum, the molecule propane will exhibit how many different types of e) eight 10. In an NMR spectrum, the molecule pentane will exhibit how many different types of equivalent hydrogens? a) one b) two e) three d) four equivalent hydroges? a) one b) two c) three d) four )five 11. The NMR . to be split into a peak corresponding to the methyl hydrogens of 2-methylpropane is expected a) singlet b) doublet c) triplet d) quartet e) more complicated pattern 12-Which isomer of C4H9Br has only one peak in its 1H-NMR spectrum having the chemical shift 8 1.8 a) 1-bromobutane c) 1-bromo-2-methylpropane b) 2-bromobutane d) 2-bromo-2-methylpropane 13- Using the proton NMR spectra and the molecular formulas C4H802, Which compound is the most reasonable for the NMR spectrum below? io 7 rpm a) CH,OCCH2CH3 c) CH3CH2OCH2CHO b) CH3CH2CH2COOH d) CH3CH2CH CH20H

Explanation / Answer

Ans 8 : c) CH3OH

In the compound methanol CH3OH , the carbon atom is attached to the most electronegative atom.

Due to this reason , the methyl group present in methanol will have the most downfield signal.

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