Which of the following is electron-deficient?

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Question

(A) Boron is an element of group $13$ and contains $3$ electrons in its valence shell.When its compound $BH_3$ dimerises to form $(BH_3)_2$ (diborane)

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$(BH_3)_2$

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(A) Boron is an element of group $13$ and contains $3$ electrons in its valence shell.When its compound $BH_3$ dimerises to form $(BH_3)_2$ (diborane),each boron atom is surrounded by only $6$ electrons,meaning its octet is incomplete.Therefore,$(BH_3)_2$ is an electron-deficient compound.In all other given molecules,the octet of the central atoms is complete.

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