[Ice-cream]

i have 2 questions on hybridisation which i'm not sure if they're right or wrong. can u guys help me out?

1. Which of the following molecules contains an sp2-sp2 sigma bond?
(a) CH4 (b) C2H2 (c) C2H4 (d) C2H6 (e) none of these

(i reckon (b)...can any1 confirm?)

2. The hybridisation of the sulfur atom in SF4 is
(a) sp (b) sp2 (c) sp3 (d) dsp3 (e) d2sp3

(i think (d) coz S atom has 4 bonds and a lone pair...is that right?)

[Garneck]

I think you need to read a bit more about hybridisation of carbon..

C2H4 has a sp2-sp2 sigma bond
Carbon in C2H2 has a sp hybridisation

[Ice-cream]

ahh, man im stupid! so wat about the 2nd Q, did i get that 1 right?

[Garneck]

Let me think. 6 valence electrons. One pair on orbital s, one pair on on s, 2 unpaired electrons. Adding d will give you 4 unpaired electrons.

Yup, sp3d