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JEE Main Chemistry question

ChemistryChemical Bonding and Molecular StructureJEE Main

How many of the following have an incomplete duplet or octet on the central atom? BeCl_2, BH_3, NH_4^+, H^+, H^-, CH_3^+, CH_3^-, CH_2

Answer: 5

Solution

(4 electrons around Be) and (6 electrons around B) both have incomplete octets. (0 electrons) has an incomplete duplet. (6 electrons around C, empty p orbital) has an incomplete octet. (6 electrons around C)

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Question ID VK-156327