Why is the bond angle 109 degrees in the antidote molecule?

[coconut62]

Homework Statement

Please refer to the image

Why is y 109 degrees?(given by my teacher)

Homework Equations

None.

The Attempt at a Solution

There are four atoms around the carbon atom, I assumed it to be tetrahedral.

Why is that wrong?

 

[DrClaude]

There are four atoms around the carbon atom, I assumed it to be tetrahedral.

And what is the angle between two bonds in a tetrahedral configuration (sp³ hybridization)?

http://en.wikipedia.org/wiki/Orbital_hybridisation

 

[coconut62]

Got it, thanks.