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Redox Reactions — Chemistry STD 11 Science — Question

Gujarat 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 LiAIH4 gets oxidized because of the addition of oxygen atom that leads to the formation of $\mathrm{OH}^{-}$Propanone $\left(\mathrm{CH}_3 \mathrm{COCH}_3\right)$ gets reduced because of addition of hydrogen atom to give propan-2-ol $\left(\mathrm{CH}_3 \mathrm{CH}(\mathrm{OH}) \mathrm{CH}_3\right)$.
  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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