Which of the following reagents will not react as an electrophile in an aromatic

Question

Which of the following reagents will not react as an electrophile in an aromatic substitution reaction?

Which of the following reagents will not react as an electrophile in an aromatic substitution reaction? (A) Br_2/FeBr_3 (B) LiAIH_4 (C) O = C = O Which of the following polycyclic molecules contains a destabilizing, antiaromatic, cyclic array of electrons in its fully planar form? Which of the following ring substituents most strongly activates chlorobenzene towards nucleophilic aromatic substitution by methoxide anion? (A) -N(CH_3)_2 (B) -OCH_3 (C)-CF_3 (D) -NO_2 Which of the following ketones has the largest dipole moment?

Explanation / Answer

Ans 5 (B) LiAlH4

Electrophiles are the reagents that seek molecules containing electron pair for bonding .

Lithium aluminium Hydride is a nucleophile because the negative charge on the hydrogen is too low for it to behave as a base and hence it does not react as an electrophile in aromatic substitution reactions .

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