The 60-MHz proton NMR spectrum of 2, 2, 3, 3-tetra-chlorobutane consists of a sharp singlet at 25oC,

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The 60-MHz proton NMR spectrum of 2, 2, 3, 3-tetra-chlorobutane consists of a sharp singlet at 25oC, but at -45oC consists of two singlets of different intensities separated by about 10 Hz.
Explain why the two lines observed at low temperature have different intensities.
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