please answer questions 6-10 clearly

Classify the reaction below as an oxidation, a reduction, or neither. cis-pent-2-ene pentane reduction oxidation neither Which of the following oxidants will convert a primary alcohol to an aldehyde? 1) sodium dichromate /sulfuric acid 3) pyridinium chlorochromate 2) copper oxide 4) dimethylsulfoxide, oxalyl chloride 3&4 3 2,3,&4 1,2,3,&4 none of the above Which of the following species would be detectable by the mass spectrometer? A and C C B and D A and B Draw the product formed when the structure shown below undergoes a reaction with CrO3. pyridine. In IR spectroscopy, the CO bond has a frequency than the C-N bond because higher, an O atom has more mass than an N atom lower, an O atom has more electronegativity than an N atom higher, an O atom has an even number of neutrons lower, an O atom has more mass than an N atom higher, an O atom has more electronegativity than an N atom