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MolSynapse / Question bank / Organic Reaction Mechanisms I: Nucleophiles and Carbonyl Addition / Electrophiles, nucleophiles, nucleophilicity and leaving groups

NEET levelSingle correct optionDifficulty 1 of 3o1001

Which of the following species is an electrophile?

A $Cl X^{-}$
B $BF X_{3}$
C $H X_{2} O$
D $NH X_{3}$

Answer: B

An electrophile is electron deficient and accepts an electron pair. In

BF X_{3}

boron has only six electrons and an empty p orbital, so it is a Lewis acid (electrophile).

NH X_{3}

,

H X_{2} O

and

Cl X^{-}

all carry lone pairs and act as nucleophiles.

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More questions on Electrophiles, nucleophiles, nucleophilicity and leaving groups