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The correct order of chemical shift in proton NMR signal will be,Alkene proton > Alkane proton >Alkyne protonAlkane proton > Alkene proton >Alkyne protonAlkene proton > Alkyne proton >Alkane protonAlkyne proton > Alkene proton >Alkane proton

Question

The correct order of chemical shift in proton NMR signal will be,Alkene proton > Alkane proton >Alkyne protonAlkane proton > Alkene proton >Alkyne protonAlkene proton > Alkyne proton >Alkane protonAlkyne proton > Alkene proton >Alkane proton

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Solution

The correct order of chemical shift in proton NMR signal is Alkene proton > Alkyne proton > Alkane proton.

Here's why:

  1. Alkene Protons: Alkene protons are attached to sp2 hybridized carbons. The deshielding effect is more in alkene protons due to the presence of pi electrons. Therefore, they have the highest chemical shift.

  2. Alkyne Protons: Alkyne protons are attached to sp hybridized carbons. They are less shielded than alkane protons but more shielded than alkene protons. Therefore, they have a chemical shift lower than alkene protons but higher than alkane protons.

  3. Alkane Protons: Alkane protons are attached to sp3 hybridized carbons. They are the most shielded among the three types of protons. Therefore, they have the lowest chemical shift.

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