Question

Solubility
Water interacts with polar substances like –OH groups but not with non-polar substances like methyl (-CH3) or ethyl groups (-CH2). Using this information, select the molecules that will easily dissolve in water based on polarity not on size. Check all that apply.
CH4
CH3OH
CH3 CH3

CH3 CH2 CH2 OH

CH3 CH2 CH2 CH2 CH2 CH3

Answer 1

@Rishabh02

Answer 2

firstly..ethyl is -C2H5

Answer 3

note that anything over about 4 carbons is relatively insoluble and by about hexane (6 carbons) it is totally insoluble. note also that molecular branching affects solubility, so t-butyl will vary in solubility compared to n-butyl.
always remember "like dissolves like"
so yeah methanol (CH3OH) is completely miscible in water
order is like Methanol>ethanol>propanol>butanol>pentanol
@Stephanie2018

Answer 4

then it is only the first one

Answer 5

it says based on polarity, so you are looking at covalent bonding with >1.5-1.7 electronegativity scale difference, and the likelihood of those showing up is when there is an oxygen present based on your list of options