MHT CET Chemistry Question (2026) — Solution

Step-by-step solution

Electrophiles are electron-deficient species that can accept an electron pair. They are either positively charged or neutral molecules with an incomplete octet or highly polar bonds. In the first series, R-OH and NH _3 have lone pairs on oxygen and nitrogen respectively, making them nucleophiles. In the second series, H _2 O and R _2 N ^- have lone pairs and a negative charge respectively, making them nucleophiles. In the third series, BF _3 is an electron-deficient Lewis acid with an incomplete octet. SO _3 has a highly electron-deficient sulfur atom due to three electronegative oxygen atoms. NO ^+ is a positively charged ion. All three are electrophiles. In the fourth series, R-NH _2 has a lone pair on nitrogen, making it a nucleophile. Answer: BF _3, SO _3, NO ^+