Infrared Spectroscopy | MCQs
مندرجہ ذیل میں سے کون سا بانڈ آئی آر میں سب سے مضبوط جذب دکھائے گا؟
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A. Sulfur-hydrogen
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B. None of these
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C. Oxygen-hydrogen
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D. Nitrogen-hydrogen
Explanation
- O-H bonds show the strongest IR absorption due to their high polarity and strong hydrogen bonding.
- They typically absorb around 3200–3600 cm⁻¹ in the IR spectrum.
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A. Rotational energy
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B. Hydrogen bonding broadens the absorption
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C. Resonance broaden the absorption
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D. Hyperconjugation resonance broadens
Explanation
- Hydrogen bonding in CH3OH causes a range of bond strengths, leading to broad absorption in the IR spectrum.
- This disrupts uniform vibrational energy levels, spreading the absorption over a wider frequency range.
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A. 1510 cm⁻¹
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B. 1710 cm⁻¹
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C. 2800 cm⁻¹
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D. 2010 cm⁻¹
Explanation
The stake-shaped band in the infrared (IR) spectrum of the carboxylic acid group typically appears around 1710 cm⁻¹.
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