How many different kinds of protons are present in each of the following molecules?
A)I = 3; II = 5; III = 5; IV = 4; V = 3
B)I = 4; II = 5; III = 4; IV = 4; V = 3
C)I = 4; II = 5; III = 5; IV = 4; V = 3
D)I = 4; II = 5; III = 5; IV = 3; V = 4

Question

How many different kinds of protons are present in each of the following molecules? 
A)I = 3; II = 5; III = 5; IV = 4; V = 3 
B)I = 4; II = 5; III = 4; IV = 4; V = 3 
C)I = 4; II = 5; III = 5; IV = 4; V = 3 
D)I = 4; II = 5; III = 5; IV = 3; V = 4

Quizplus · Accepted Answer

In each molecule, we count the number of different kinds of atoms bonded to protons.

I: CH4 - 4 different atoms bonded to protons (C, H)
II: CH3COOH - 5 different atoms bonded to protons (C, H, O)
III: H2O2 - 5 different atoms bonded to protons (H, O)
IV: NH3 - 4 different atoms bonded to protons (N, H)
V: NH4+ - 3 different atoms bonded to protons (N, H)

Therefore, the total number of different kinds of protons in each molecule is:
I = 4
II = 5
III = 5
IV = 4
V = 3

Out of the given choices, option C is the only one that matches these results.

How Many Different Kinds of Protons Are Present in Each