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Question

Electromeric effect

A
Comes into play at the demand of attacking reagent
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B
Involves displacement of electrons in a sigma bond
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C
Comes into play in the molecule when at least one atom has unshared pair of electrons
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D
Involves the distortion of electron cloud
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Solution

The correct option is A Comes into play at the demand of attacking reagent
This effect exists only in the presence of an attacking reagent.

When a compound having multiple bonds is approached by a charged reagent, the pi electrons of the bond shifts towards one of the constituent atoms. The atom which acquires the electron pair gets a -ve charges while other atoms get a +ve charge.

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