(B) In the structure of diborane $(B_2H_6)$,there are four terminal $B-H$ bonds,each of which is a $2$-centre-$2$-electron $(2c-2e^-)$ bond.There are

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(B) In the structure of diborane $(B_2H_6)$,there are four terminal $B-H$ bonds,each of which is a $2$-centre-$2$-electron $(2c-2e^-)$ bond.There are two bridging $B-H-B$ bonds,each of which is a $3$-centre-$2$-electron $(3c-2e^-)$ bond.Thus,the number of $2c-2e^-$ bonds is $4$ and the number of $3c-2e^-$ bonds is $2$.