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Electrophiles are electron seeking species. Which of the following groups contain only electrophiles?

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${CCl}_{2}, {SO}_{3}, {NO}_{2}^{\oplus}$

${BF}_{3}, {NH}_{3} . H_{2} O$

answer is A.

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Detailed Solution

:CCl₂ has 6 electrons with incomplete octet in its lewis structure. Hence, it is electron deficient.

In SO₃, all the oxygen atoms pull electrons towards themselves making sulphur partially positive. Thus, it is an electrophile.

$\overset{\oplus}{N} O_{2}$ is an electrophile due to a positive charge on it.

NH₃ and H₂O are electron rich molecules due to the presence of lone pair of electrons.

${NO}_{2}^{⊝}$ is electron rich due to a negative charge on it.

$C_{2} H_{5}^{⊝}$ is electron rich due to a negative charge on it.

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