Which of the following molecules and ions are electrophilic?

Enter your selections in the answer box (type in the appropriate letter for each choice).
Do not enter superfluous characters, since they will be counted as incorrect answers.

A
CH4
B
H2O
C
Br(+)
D
H2C=CH2
E
BF3
F
NO2(+)
G
NH3
H
Br(-)

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This script written by William Reusch, Dept. of Chemistry, Michigan State University. Please send comments and corrections to whreusch@pilot.msu.edu.