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Redox Reactions — Chemistry STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceChemistryRedox Reactions3 Marks
Question
Decide whether each of the following reaction involves oxidation reduction reaction or not. If it does, identify which species is oxidised and which gets reduced?
  1. $\ \ \ \ \ \ \ \ \ {\text{O}\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{OH}}\\\ \ \ \ \ \ \ \ \ \ \|\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ |\\ 4\text{CH}_3\text{CCH}_3+\text{LiAlH}_4+4\text{H}_2\text{O}\rightleftharpoons4\text{CH}_3\text{CHCH}_3+\text{LiOH}+\text{Al}(\text{OH})_3$
  2. $\text{CH}_3\text{CH}_2\text{OH}\xrightarrow{\ \text{H}_2\text{SO}_4\ \ }\text{CH}_2=\text{CH}_2+\text{H}_2\text{O}$
  3. $\ \ \ \ \ \ \ {\text{O}\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{O}}\\\ \ \ \ \ \ \ \ \|\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \|\\\text{CH}_3\text{C OH}+\text{CH}_3\text{NH}_2\rightleftharpoons\text{CH}_3\text{CO}^-+\text{CH}_3\text{NH}^+_3$
✓

Answer

  1. In this redox reaction, H in LiAlH4 gets oxidized because of the addition of oxygen atom that leads to the formation of OH- Propanone (CH3COCH3) gets reduced because of addition of hydrogen atom to give propan-2-ol (CH3 CH(OH)CH3).
  2. This is not a redox reaction as neither hydrogen or oxygen or electron is removed or added.
  3. This is not a redox reaction as neither hydrogen or oxygen or electron is removed or added.

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