Photo AI
Isomers X and Y have the molecular formula C3H8O Isomer X Isomer Y 07.1 Give the IUPAC name for isomer X - AQA - A-Level Chemistry - Question 7 - 2019 - Paper 2
Question 7
Isomers X and Y have the molecular formula C3H8O Isomer X Isomer Y 07.1 Give the IUPAC name for isomer X. [1 mark] 07.2 Explain how and why isomers X and Y can b... show full transcript
Worked Solution & Example Answer:Isomers X and Y have the molecular formula C3H8O Isomer X Isomer Y 07.1 Give the IUPAC name for isomer X - AQA - A-Level Chemistry - Question 7 - 2019 - Paper 2
Step 1
Step 2
07.2 Explain how and why isomers X and Y can be distinguished by comparing each of their boiling points.
Answer
The boiling point of isomer X (cyclopropanol) is generally lower than that of isomer Y due to the presence of hydrogen bonds in isomer Y (which is typically more linear or branched). This allows isomer Y to have stronger intermolecular forces, resulting in a higher boiling point.
Step 3
07.2 Explain how and why isomers X and Y can be distinguished by comparing each of their 13C NMR spectra.
Answer
In the 13C NMR spectrum, isomer X will generally show fewer peaks compared to isomer Y due to its symmetrical structure. Isomer X may show 2 peaks corresponding to its unique carbon environments, while isomer Y may have a more complex spectrum, showing multiple peaks in the region of 50-80 ppm, indicating different carbon environments.
Step 4
07.2 Explain how and why isomers X and Y can be distinguished by comparing each of their infrared spectra.
Answer
In the infrared spectra, isomer Y is expected to exhibit a characteristic broad O-H stretching vibration around 3200-3600 cm⁻¹ due to the hydroxyl group, while isomer X may show weaker or less defined peaks since it does not contain an alcohol functional group. Furthermore, the fingerprint region of the spectra will be different, allowing for distinct identification of the two isomers.