JEE Advanced 2019 Chemistry question

Among , , , , and , the total number of molecules containing covalent bond between two atoms of the same kind is

Answer: 4

Solution

: the two borons are joined only through B-H-B bridge bonds, no B-B bond. (borazine): alternate B and N atoms in the ring, no B-B or N-N bond. ():

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Question ID VK-026838