Summer 2026 Predicted
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1 An unknown organic compound X contains carbon, hydrogen, and oxygen
only.
The following analytical data were obtained:
Combustion analysis:
0.440 g of compound X produced 0.880 g of CO₂ and 0.360 g of H₂O
Mass spectrum:
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Infrared spectrum:
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Proton NMR spectrum:
The table shows the integration trace data and splitting patterns:
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δ/ppm Integration Splitting
12.0 1 Singlet
2.30 2 Triplet
1.65 2 Sextet
0.95 3 Triplet
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, (a) (i) Use the combustion data to determine the empirical formula of
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compound X. Show your working clearly.
(4)
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(ii) Deduce the molecular formula of compound X using the empirical formula
and the mass spectrum data.
(1)
……………………………………………………………………………………………………………………………………
……………………………………………………………………………………………………………………………………
……………………………………………………………………………………………………………………………………
……………………………………………………………………………………………………………………………………
……………………………………………………………………………………………………………………………………
for more papers: tyrionpapers.com
for more papers: tyrionpapers.com
,DO NOT WRITE IN THIS AREA
1 An unknown organic compound X contains carbon, hydrogen, and oxygen
only.
The following analytical data were obtained:
Combustion analysis:
0.440 g of compound X produced 0.880 g of CO₂ and 0.360 g of H₂O
Mass spectrum:
DO NOT WRITE IN THIS AREA
Infrared spectrum:
for more papers: tyrionpapers.com
, DO NOT WRITE IN THIS AREA
Proton NMR spectrum:
The table shows the integration trace data and splitting patterns:
DO NOT WRITE IN THIS AREA
δ/ppm Integration Splitting
12.0 1 Singlet
2.30 2 Triplet
1.65 2 Sextet
0.95 3 Triplet
for more papers: tyrionpapers.com
, (a) (i) Use the combustion data to determine the empirical formula of
DO NOT WRITE IN THIS AREA
compound X. Show your working clearly.
(4)
DO NOT WRITE IN THIS AREA
(ii) Deduce the molecular formula of compound X using the empirical formula
and the mass spectrum data.
(1)
……………………………………………………………………………………………………………………………………
……………………………………………………………………………………………………………………………………
……………………………………………………………………………………………………………………………………
……………………………………………………………………………………………………………………………………
……………………………………………………………………………………………………………………………………
for more papers: tyrionpapers.com