Question on 2009 ADA exam #80

[StayFlossin]

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So number 80 on the 2009 exam. it shows a Carbon connected to a 3 carbons and a hydrogen and asks for the bond angle.. It says the answer is 120 degrees but since its a sp3 carbon shouldn't it be 109.5? just making sure its a mistake and all this studying isn't making me go crazy.

 

[201Blue]

I would agree with that because tetrahedrals are 109. Did it give an explanation in the answer key?

 

[StayFlossin]

I would agree with that because tetrahedrals are 109. Did it give an explanation in the answer key?

No Explanations just answers, but I'm glad someone agrees with me ha

 

[CustomGrills51]

They messed up some of the answers on purpose, Im goin to do the 09 test soon and Ill post on here when I find the corrections.

 

[C0LA]

bump - was this in fact an error or is the bond angle actually 120 degrees? It asked for the bond angle between two sp3 single bonds so I think it should be 109.5. Any confirmation?

 

[C0LA]

the attachment is the original question. Says answer is D however I still think it is C.

 

[free99]

I call malarkey, fairly confident the answer is C.

 

[deleted675097]

So number 80 on the 2009 exam. it shows a Carbon connected to a 3 carbons and a hydrogen and asks for the bond angle.. It says the answer is 120 degrees but since its a sp3 carbon shouldn't it be 109.5? just making sure its a mistake and all this studying isn't making me go crazy.

I just took it, too, and noticed the same thing. It think you're right. It's 109.5.

 

[BYU4you]

Although an old thread revived, worth mentioning nontheless.

The 2009 Ada test actually has 2 different versions. One with an incorrect answer and one with a correct. The angle it refers to is different on the different versions.