Which compound show major fragment ions in ns mass spectrum at m/z 85 and 57? No

Question

Which compound show major fragment ions in ns mass spectrum at m/z 85 and 57? Notice that all options are constitutional isomers, therefore, same MW. Which of the following processes takes place upon absorption of ultraviolet-visible radiation? bond vibration electron excitation nuclear spin flip electron spin flip Which of the following electronic transitions is apparent in the ultraviolet-visible spectrum of 1.3- butadiene? n rightarrow pi* pi rightarrow pi* sigma rightarrow pi* sigma rightarrow pi Identify the compound with live lowest wavelength in an UV spectrum. 1-decent 1, 3-decadicne 1, 3, 5-decatriene 1, 4-decadiene 1, 3, 5, 7-decatetraene In UV-Vis spectroscopy, an increase in the compound's electron delocalization is correlated with _____ in the energy gap between the LUMO. and the HOMO, which in mm causes _____ in lambda_max for the absorption band- a decrease, a decrease a decrease, an increase an increase, a decrease an increase, an increase an increase, a decrease

Explanation / Answer

Ans 17 B

The absorption of UV or visible radiation causes excitation of outer electrons of an atom. When the electron receives a Frequency equal to or Greater than the threshold frequency, it is promoted to excited state from its ground state.

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