Same chapter3 marksDifficulty: Medium
Why is carbon monoxide a poison?
Some p-Block Elements
3 marksDifficulty: Medium
Why is diborane described as an electron-deficient molecule?
Original Khojo Papers practice question — not from a past board paper.
Answer
Diborane, B2H6, has only twelve valence electrons but appears to need sixteen to form eight ordinary two-electron bonds. Four of the bonds are ordinary terminal B–H bonds, and the two bridging hydrogen atoms are held by three-centre two-electron bonds in which one pair of electrons binds three atoms.
No citable source has been recorded for this record. Treat it as practice material, not as fact.
Explanation
This banana-bond arrangement is the classic example of electron deficiency.
Related questions
From the same topic and chapter, at a similar level.
Same chapter3 marksDifficulty: Medium
What is the inert pair effect, and how does it show itself in group 14?
Some p-Block Elements
Same chapter3 marksDifficulty: Medium
Why does boron show anomalous behaviour compared with the other group 13 elements?
Some p-Block Elements
Same subject3 marksDifficulty: Medium
A compound contains 40% carbon, 6.7% hydrogen and 53.3% oxygen. Its molar mass is 180 g. Find its empirical and molecular formulae.
Some Basic Concepts of Chemistry
Same subject3 marksDifficulty: Medium
State Hund's rule and the Aufbau principle.
Structure of Atom
Same subject3 marksDifficulty: Medium
State the four quantum numbers and what each describes.
Structure of Atom