Answer:
Substance 1 and 3.
Step-by-step explanation:
The following data were obtained from the question:
Substance >>>>> chemical formula
1 >>>>>>>>>>>>>> C2H6O
2 >>>>>>>>>>>>>> C8H18
3 >>>>>>>>>>>>>> CH3CH2Br
4 >>>>>>>>>>>>>> C4H10O
Next, we shall determine the number of carbon in each substance as follow:
Substance 1 (C2H6O):
Number of carbon atom = 2
Substance 2 (C8H18)
Number of carbon atom = 8
Substance 3 (CH3CH2Br)
Number of carbon atom = 1 + 1 = 2
Substance 4 (C4H10O)
Number of carbon atom = 4
From the above illustrations,
Substance 1 and 3 has the same number of carbon atom