I2

Question 1

What are wades rules?

Answer 1

1) Count totoal no. of VE’s 3 per B 1 per H
2) Subtract 2 e’s for each terminal B-H
3) Based on no. of cluster electrons assign structure

Question 2

What are the 3 structural arrangements as described in wades rules?

Answer 2

Closo- 2n + 2 electrons - n vertex deltahedron
Nido- 2n + 4 electrons - n+1 vertex deltahedron
Arachno- 2n + 6 electrons - n+2 vertex deltahedron

Question 3

What XeF’s exist

Answer 3

XeF2 linear with electrons above and a wedge and hash beneath
XeF4 square planar with electrons above and beneath
XeF6 octahedral with a hash of electrons out the back

Question 4

What sulfur compound is naturally occurring. Also seen in Selenium

Answer 4

Alpha-Sulfur (S8) like boat conformation, prep SN2 with SO3(2-)
S8 + 8SO3(2-) —> 8 S2O3(2-)
S2O3(2-) + I2 —> I- + (-)O3-S-S-S-SO3(-)

Question 5

How is Tellurium Obtained?

Answer 5

Electrolysis of TeO2

Question 6

What is the structure of B2H6

Answer 6

‘Banana bonds’ 4 SP3 orbitals for 2Px, 2Py, 2Pz
Boron’s joined by 2 bridging H ligands