22. Analytical techniques
A section of Chemistry, 9701
Listing 10 of 112 questions
Compound S is used in food flavourings. A possible synthesis of S is shown in . CN HBr reaction 1 KCN in ethanol reaction 2 H+reaction 3 P R COOH S Q P, Q, R and S show stereoisomerism. Complete Table 4.1 by identifying with a tick (3) the type of stereoisomerism that each molecule shows. The type of stereoisomerism shown by Q is given. Table 4.1 P Q R S geometrical isomerism optical isomerism Give the structural formula of Q. Name the mechanism in reaction 2. Complete the equation for reaction 3. R is represented as C4H9CN. C4H9CN + Compounds S and T react to form organic compound U, which has a single functional group. COOH S + + H2O T U Table 4.2 shows some data from the mass spectrum of U. Table 4.2 peak relative abundance M+ 7.2 [M+1]+ 0.55 Use the data from Table 4.2 to show that U contains 7 carbon atoms. Show your working. shows the infrared spectrum of U. wavenumber / cm–1 transmittance / % Table 4.3 bond functional groups containing the bond characteristic infrared absorption range (in wavenumbers) / cm–1 C–O hydroxy, ester 1040–1300 C=C aromatic compound, alkene 1500–1680 C=O amide carbonyl, carboxyl ester 1640–1690 1670–1740 1710–1750 C≡N nitrile 2200–2250 C–H alkane 2850–2950 N–H amine, amide 3300–3500 O–H carboxyl hydroxy 2500–3000 3200–3650 Use and Table 4.3 to identify the functional group present in U. Explain your answer fully. functional group explanation T also has a single functional group. Use the information in and your answer to to identify T and U. Draw the structures of T and U in the boxes. T U
9701_m24_qp_22
THEORY
2024
Paper 2, Variant 2
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