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Among the isomers of C4H6 given below, the compound which exhibits an absorption band at 3300 cm-1 in the IR spectrum, is:
- a)1, 3-butadiene
- b)1-butyne
- c)2-butyne
- d)cyclo butane.
Correct answer is option 'B'. Can you explain this answer?
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Among the isomers of C4H6 given below, the compound which exhibits an ...
IR Spectrum and Isomers of C4H6:
IR spectrum is a technique used for identifying the functional groups present in a molecule. It measures the absorption of infrared radiation by the molecule, which is related to the vibrational modes of the chemical bonds in the molecule. Isomers are molecules that have the same molecular formula but different structures.
Identifying the Compound with Absorption Band at 3300 cm-1:
The absorption band at 3300 cm-1 in the IR spectrum is characteristic of a C-H bond that is attached to a sp hybridized carbon atom. Therefore, we need to identify the isomer of C4H6 that has such a bond.
1,3-butadiene has two sp2 hybridized carbon atoms and two C-H bonds, but none of them is attached to an sp hybridized carbon atom. Therefore, it does not exhibit an absorption band at 3300 cm-1.
2-butyne has one sp hybridized carbon atom and one C-H bond attached to it, which exhibits an absorption band at 3300 cm-1 in the IR spectrum. Therefore, it is the correct answer.
1-butyne has one sp hybridized carbon atom, but it has two C-H bonds, none of which exhibit an absorption band at 3300 cm-1.
Cyclobutane has four sp3 hybridized carbon atoms, which do not exhibit any C-H bond with an absorption band at 3300 cm-1 in the IR spectrum.
Conclusion:
Therefore, the correct answer is option 'B' - 1-butyne, which exhibits an absorption band at 3300 cm-1 in the IR spectrum due to the C-H bond attached to the sp hybridized carbon atom.
IR spectrum is a technique used for identifying the functional groups present in a molecule. It measures the absorption of infrared radiation by the molecule, which is related to the vibrational modes of the chemical bonds in the molecule. Isomers are molecules that have the same molecular formula but different structures.
Identifying the Compound with Absorption Band at 3300 cm-1:
The absorption band at 3300 cm-1 in the IR spectrum is characteristic of a C-H bond that is attached to a sp hybridized carbon atom. Therefore, we need to identify the isomer of C4H6 that has such a bond.
1,3-butadiene has two sp2 hybridized carbon atoms and two C-H bonds, but none of them is attached to an sp hybridized carbon atom. Therefore, it does not exhibit an absorption band at 3300 cm-1.
2-butyne has one sp hybridized carbon atom and one C-H bond attached to it, which exhibits an absorption band at 3300 cm-1 in the IR spectrum. Therefore, it is the correct answer.
1-butyne has one sp hybridized carbon atom, but it has two C-H bonds, none of which exhibit an absorption band at 3300 cm-1.
Cyclobutane has four sp3 hybridized carbon atoms, which do not exhibit any C-H bond with an absorption band at 3300 cm-1 in the IR spectrum.
Conclusion:
Therefore, the correct answer is option 'B' - 1-butyne, which exhibits an absorption band at 3300 cm-1 in the IR spectrum due to the C-H bond attached to the sp hybridized carbon atom.
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Among the isomers of C4H6 given below, the compound which exhibits an ...
Due to I.R Stretching frequency of spC-H
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