AP EAMCET · Chemistry · p Block Elements (Group 13 & 14)

The structure of diborane $B_{2} H_{6}$ is given below. Identify the bond angles $x, y .$ In diborane, which bonds are commonly known as banana-bonds

A $x = 101 °, y = 118 °$ and $2 -$ centered $- 3 -$ electron bonds
B $x = 120 °, y = 97 °$ and $3 -$ centered $- 2 -$ electron bonds
C $x = 118 °, y = 79 °$ and ionic bond between the two B's
D $x = 79 °, y = 118 °$ and ionic bond between the two B's

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Answer & Solution

Correct Answer

(B) $x = 120 °, y = 97 °$ and $3 -$ centered $- 2 -$ electron bonds

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Detailed explanation

The diborane is an electron deficient molecule. The two boron atoms and four terminal hydrogen atoms of the molecule are in the same plane. The bridging B-H bonds are 3-centered 2-electron bonds whereas the four B-H bonds are 2-centered 2-electrons bonds and the bridging H-B-H…

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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The structure of diborane B2H6 is given below. Identify the bond angles x, y. In diborane, which bonds are commonly known as banana-bonds

Step-by-step Solution

The structure of diborane $B_{2} H_{6}$ is given below. Identify the bond angles $x, y .$ In diborane, which bonds are commonly known as banana-bonds