Test 2 Number of Hydrogen Bonding Sites on Caffeine

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Alan Wu
Posts: 61
Joined: Sat Sep 14, 2019 12:16 am

Test 2 Number of Hydrogen Bonding Sites on Caffeine

Postby Alan Wu » Sat Nov 30, 2019 2:16 pm

How many hydrogen bonding sites are on caffeine?
Image

There are 8 lone pairs of electrons in total on N and O atoms in caffeine.
There are no H atoms bonded to N, O, or F atoms in caffeine.
Therefore, shouldn't the number of hydrogen bonding sites on caffeine be 8? Why is 8 not the right answer?
What is the correct answer and why?

Drake Choi_1I
Posts: 58
Joined: Sat Aug 17, 2019 12:15 am

Re: Test 2 Number of Hydrogen Bonding Sites on Caffeine

Postby Drake Choi_1I » Sat Nov 30, 2019 2:19 pm

The correct answer is 3 but I also got it incorrect so cannot help on the why part. Hopefully someone else can help us both :)

Siya Shah 1J
Posts: 50
Joined: Sat Aug 17, 2019 12:15 am

Re: Test 2 Number of Hydrogen Bonding Sites on Caffeine

Postby Siya Shah 1J » Sat Nov 30, 2019 3:55 pm

The correct answer on my test was 9 hydrogen bonds.


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