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3. which of the following is not true?
A. In Polar Reaction a, nucleophile reacts an elctrophile
B. Carboactions are elcrophiles
C. Carboanions are nucleophile
D. A Half-headed curver arrow shows the movemant of an electron pair 4. Which of the following statements is true? A. The size of the activiation energy tells us about the reaction mecanism
B. The size of the activiation energy tells us about the reaction rate
C. A show reaction has low reaction energy
D. A fast reaction has large reaction energy

Sagot :

Which of the following statements regarding electrophiles is untrue? According to ideas about acid-base reactions, electrophiles are Lewis acids rather than Lewis bases because they receive electrons.

Because their partial positive charge is masked by polar bonding and/or resonance, electrophiles can be hard to spot. We thus come to the conclusion that the proper understanding of an electrophile is that it may exist as a positively charged or neutral species and that it can establish a bond by receiving a pair of electrons from a nucleophile. So, the appropriate choice is BF3 is an electron-poor substance. It lacks a spare pair of electrons that it could provide. It is therefore not nucleophilic.

When two bound atoms separate, one takes more of the shared electrons than the other, and this causes a polar reaction.

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