Using 1H NMR, what key features would be used to differentiate benzene, hexane and 1,2-dichloroethane?Group of answer choicesHexane would give a singlet at 7-8 ppmBenzene would give multiple signals (triplets, quartets etc.) in the 0-1.5 ppm region1,2-dichloroethane would give a singlet in the 2.5-5 ppm region1,2-dichloroethane would give a singlet at 7-8 ppmBenzene would give multiple signals (triplets, quartets etc.) in the 0-1.5 ppm regionHexane would give a singlet in the 2.5-5 ppm regionBenzene would give a singlet at 7-8 ppmHexane would give multiple signals (triplets, quartets etc.) in the 0-1.5 ppm region1,2-dichloroethane would give a singlet in the 2.5-5 ppm region1,2-dichloroethane would give a singlet at 7-8 ppmHexane would give multiple signals (triplets, quartets etc.) in the 0-1.5 ppm regionBenzene would give a singlet in the 2.5-5 ppm region
Question
Using 1H NMR, what key features would be used to differentiate benzene, hexane and 1,2-dichloroethane?Group of answer choicesHexane would give a singlet at 7-8 ppmBenzene would give multiple signals (triplets, quartets etc.) in the 0-1.5 ppm region1,2-dichloroethane would give a singlet in the 2.5-5 ppm region1,2-dichloroethane would give a singlet at 7-8 ppmBenzene would give multiple signals (triplets, quartets etc.) in the 0-1.5 ppm regionHexane would give a singlet in the 2.5-5 ppm regionBenzene would give a singlet at 7-8 ppmHexane would give multiple signals (triplets, quartets etc.) in the 0-1.5 ppm region1,2-dichloroethane would give a singlet in the 2.5-5 ppm region1,2-dichloroethane would give a singlet at 7-8 ppmHexane would give multiple signals (triplets, quartets etc.) in the 0-1.5 ppm regionBenzene would give a singlet in the 2.5-5 ppm region
Solution
In 1H NMR spectroscopy, the chemical shift and splitting pattern of signals can help differentiate between different types of compounds. Here's how you would differentiate benzene, hexane, and 1,2-dichloroethane:
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Benzene (C6H6) is an aromatic compound. The protons in benzene are all equivalent and are found in a highly deshielded environment due to the aromatic ring current. Therefore, benzene would give a singlet (one peak because all the hydrogens are in the same environment) in the region of 7-8 ppm.
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Hexane (C6H14) is an alkane, and all of its protons are equivalent, being part of CH2 groups in a chain. Therefore, hexane would give a singlet, but it would be in the region of 0-1.5 ppm, which is typical for alkanes.
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1,2-dichloroethane (C2H4Cl2) has two different types of protons: those on the carbon adjacent to the chlorine atoms and those on the other carbon. However, due to rapid rotation about the C-C bond, these two types of protons are equivalent on the NMR timescale. Therefore, 1,2-dichloroethane would give a singlet, but it would be in the region of 3-4 ppm, which is typical for protons on a carbon adjacent to a halogen.
So, the correct answer choices would be:
- Benzene would give a singlet at 7-8 ppm
- Hexane would give a singlet in the 0-1.5 ppm region
- 1,2-dichloroethane would give a singlet in the 3-4 ppm region (none of the provided options exactly match this, but "1,2-dichloroethane would give a singlet in the 2.5-5 ppm region" is the closest).
Similar Questions
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