Organic Chemistry Spectroscopy Please provide answers for all 3 questions and ex

Question

Organic Chemistry Spectroscopy

Please provide answers for all 3 questions and explain, Thanks!!!

An sp-hybridized carbon atom is more electronegative than an sp^2 carbon. The H-atom on a terminal alkyne is found upfield from a vinyl proton. Why is this true? Chemical shift decreases with increasing electronegativity. Rotation of the pi electrons produces an induced magnetic field that deshields the H-atom. Rotation of the pi electrons about the triple bond induces a magnetic field that shields the H-atom. Which of the following is used in nuclear magnetic resonance spectroscopy? X-ray infrared visible radio ultraviolet Consider the^1H-NMR spectrum of isopropyl butanoate. Which signal has the highest integrated signal area? the methyl signal that shows as a doublet the methylene signal that shows as a complicated multiplet the methylene signal that shows as a triplet the methyl signal that shows as a triplet the methine signal that shows as a septet

Explanation / Answer

21.

induced magnetic field shield the protons of triple bond, because of that it will appear at lower chemical shift values

Ans is C.

22.

Radio.

28.

two methyls (6 protons) in isopropyls comes as doublet.

Ans is: D (compare to other answers): in given answers one methyl singnal shows as a triplet

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