Combine evidence from percentage composition, degree of unsaturation, mass spectrometry, IR and 1H NMR spectra to determine the structure of an unknown organic compound, justifying each deduction from the data.
Tę umiejętność sprawdza 6 zadań wzorowanych na arkuszach IB z lat 2022–2025.
In the mass spectrum of Y, the molecular ion peak appears at m/z 88. (i) Y contains no multiple carbon–carbon bonds and no rings. Deduce its molecular formula. Use section 7 of the data booklet. Shown below is the high-resolution NMR spectrum of Y,…
The IR spectrum of HA is shown. Two absorption bands are labelled: Y is a very broad band centred near 3000 cm−1 and Z is a band of medium intensity near 1650 cm−1. (i) Using section 20 of the data booklet, identify the functional…
Deduce one possible structural formula of A that fits all of the evidence above.
Propenal can be oxidised to compound G. G produces bubbles of gas when it is added to aqueous sodium hydrogencarbonate. The mass spectrum of G is shown. Deduce what G is and give two reasons, based on the mass spectrum.
An unknown organic compound, X, contains only carbon, hydrogen and oxygen. Elemental analysis shows that it contains 54.5 % carbon and 36.3 % oxygen by mass. (i) Determine the empirical formula of X. The mass spectrum of X is shown. (ii) Identify the species…
What information about pentan-2-one, CH3COCH2CH2CH3, can be obtained from mass spectrometry (MS), infrared (IR) spectroscopy and 1H NMR spectroscopy? A. MS: the compound contains a carbonyl group; IR: the molar mass is 86 g mol−1;…
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