Question

the experiment is the dehydratipn of 2-methylcyclohexanol

4. What purpose does KMnO4serve in this experiment? (1) s the and ㄴhich is 5. Define the following terms (4) Mass Spectrometery: Base Peak: Molecular ion (M):

Answer 1

4. Purpose of KMnO4 in dehydration of 2-methylcyclohexanol:

Dehydration means removal of water and generally done by H2SO4. When an alcohol undergoes dehydration it produces alkene bond by cleaving H and OH from adjacent carbon. 2-Methyl cyclohexanol can produce alkene also but due to nature of compound and mechanism it produces mixture of alkene and to find out the products they are subjected to oxidative cleavage using KMnO₄

5. Mass spectrometry: This is very common analytical technique which determines the molecular mass of analyte or compound. The compound ionizes based on present ions and detected by proper detector by mass to charge ratio.

Base peak: This is the term used in the mass spectrum analysis and is the tallest peak by height where the ion abundance is 100%. This is due to best ionization of molecule where highest mass to charge ratio is there.

Molecular Ion (M+): M+ peak is the peak found in mass spectra due to formation of molecular ion. All molecules ionizes in the mass spectrum analysis and the ion produces due to that whole molecule without any fragmentation. Without isotope it is generally the actual mass of that analyte.

GC/MS: This is the short form of gas chromatography with mass spectrometry. It is also an analytical technique which use the features of gas chromatography to separate the mixture of compounds and analyze the separated component with mass spectrometry. This is also called Tandem chromatography.