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Ответ:
C
B
A
Explanation:
The first hydrocarbon has a molecular formula of C6H14
Second has C8H18
The third has C10H22
It is expected that the higher the number of carbon in the chain of an alkane, the less fluid it is.
This explains why the first three members are gases , while others are liquids and solids subsequently.
Hence the third has the less fluidity and hence more viscosity since it has the longest chain, the second has lesser while the first has the least.
The answer is simply based on their chain length.