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Chemistry Question on p -Block Elements

In diborane (B2H6)(B_2H_6) there are

A

three 3c−2e−3c - 2e^- bonds and three 2c−2e−2c - 2e^- bonds

B

four 3c−2e−3c - 2e^- bonds and two 2c−2e−2c - 2e^- bonds

C

two 3c−2e−3c - 2e^- bonds and four 2c−2e−2c - 2e^- bonds

D

None of the above

Answer

two 3c−2e−3c - 2e^- bonds and four 2c−2e−2c - 2e^- bonds

Explanation

Solution

The structure of diborane is shown below


?? Boron electron
?? Hydrogen electron
The four terminal B?HB?H bonds are regular bonds (2c−2e−(2c - 2e^- bonds) but the two bridge B−HB - H bonds are different and formed only by sharing of two electrons (3c−2e−3c - 2e^- bonds).