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Q. Which of the following does not show resonance effect?

Organic Chemistry – Some Basic Principles and Techniques

Solution:

Resonance effect involves delocalisation of $π$-electrons of two or more conjugated double bonds or non-bonding electrons and $π$-electrons of a double bond.
$\underset{\text{Isopropyl isothiocyanate}}{(CH_{3})_{2}CH - SC \equiv N}$ does not show resonance effect.

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