Question
What is resonance effect and it is of how many types? Explain with examples.
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Answer
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→An aqueous solution of $CuCl_2$ with platinum electrodes.
Calculate the enthalpy change for the process$\text{CCI}_4(\text{g})\xrightarrow{ \ \ \ \ \ }\text{C}(\text{g})+4\text{CI}(\text{g})$
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→and calculate bond enthalpy of $C – Cl$ in $CCl_4$(g).$\Delta_\text{vap}\text{H}^\ominus(\text{CCI}_4)=30.5\text{kJ} \ \text{mol}^{-1}.$
$\Delta_\text{f}\text{H}^\ominus(\text{CCI}_4)=-135.5\text{kJ} \ \text{mol}^{-1}.$
$\Delta_\text{a}\text{H}^\ominus(\text{C})=-715.0\text{kJ} \ \text{mol}^{-1},$ where $\Delta_\text{a}\text{H}^\ominus$ is enthalpy of atomisation
$\Delta_\text{a}\text{H}^\ominus(\text{CI}_2)=242\text{kJ} \ \text{mol}^{-1}$
Match the ions given in Column I with their nature given in Column II.
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Column I
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Column II
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(i)
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(a)
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Stable due to resonance.
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(ii)
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$\text{F}_3-\text{C}^\oplus$
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(b)
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Destabilised due to inductive effect.
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(iii)
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$\ \ \ \ \ \ \ \ \ \ \ \ \text{CH}_3\\\ \ \ \ \ \ \ \ \ \ \ \ \ |\\\text{CH}_3-\text{C}^\ominus\\\ \ \ \ \ \ \ \ \ \ \ \ \ \ |\\\ \ \ \ \ \ \ \ \ \ \ \ \ \text{CH}_3$
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(c)
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Stabilised by hyperconjugation.
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(iv)
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$\ \ \ \ \ \ \ \ \ \ \ \ \ _\oplus\\\text{CH}_3-\text{CH}-\text{CH}_3$
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(d)
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A secondary carbocation.
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