In the set of A - NH3 and H2O are not the electrophiles as they have lone pair of electrons.
In the set of B – AlCl3, SO3, NO2+ are the electrophiles as AlCl3 is electron-deficient which tends to seek electron and later, SO3, NO2+ both are electrophiles.
In the set of C - NO2+, CH3+, CH3—C+=O are all electrophiles as because of positive charges.
In the set of D – all are not electrophiles as one of them have a negating charge which is a neutrophile indeed.
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