Write the number of peaks expected in the H NMR spectra of these compounds. writ

Question

Write the number of peaks expected in the H NMR spectra of these compounds. write the peak area (integration) ratios expected H NMR spectra of these compounds. write the multiplicity (coupling) expected for underlined protons in the 1 HNMR spectra of these compounds Write the number of peaks expected in the 13 C NMR spectra of these compounds. Arrange the following compounds A, B, C in increasing UV-Vis absorption maximum wavelength value (lambda _max). 4-methyl-hepta-1, 3, 5-triene 2-methyl-hepta-1, 3, 6-triene Cyclohepta-1, 4-diene Predict the mass spectrum (m/e values) of 2, 4 - dimethly-pentane (C = 12, H = 1)

Explanation / Answer

1. a).4 peaks. One singlet for methyl group, one for ---OCH3 and one doublet each for two sets of ortho protons.

b).2 peaks. One for all the hydrogens on the two methyl groups and one for the other hydrogen(CH-Br)

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