Chemistry 9701 · AS & A Level · Analytical techniques

Analytical techniques — practice question

In Fig. 7.1, four esters, A, B, C and D, all have the molecular formula $\text{C}_6\text{H}_{12}\text{O}_2$.
(a)[1]

State the systematic name of ester A.

(b(i))[1]

State what retention time means.

(b(ii))[1]

Calculate the percentage by mass of ester D present in the original mixture.

(c(i))[2]

Complete Table 7.1 by giving the number of peaks in each NMR spectrum for esters B and C.

(c(ii))[1]

Identify every ester from A, B, C and D that has at least one triplet peak in its proton ($^1\text{H}$) NMR spectrum.

(d)[6]

Draw compounds F, G, H, J, K and L in the boxes provided in Fig. 7.3.

Worked solution & mark scheme

This 12-mark question has a full step-by-step worked solution and mark scheme. One marking point: The name is methyl pentanoate.

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