Question

out these molecules: ethyl alcohol, water, glucose, acetic acid, glycine, urea, pyruvic acid, acetaldehyde, butryic acid, uracil, and acetone, which is most hydrophobic

Answer 1

its URACIL . all others are hydrophilic @MonalGarg

Answer 2

how do you know?

Answer 3

see the molecules with max no of C and H and very less or rather no O is hydrophobic...so u can start eliminating all the molecules having oxygen...

Answer 4

this is not the definition of hydrophobicity..but just to make this problem simple its a simple solution...:P

Answer 5

but uracil also has oxygen in it

Answer 6

see uracil is a ring structure....so its hydrophobicity dominantes the effect of oxygen...

Answer 7

because acetone (CH3)2CO has saturated c-h bonds

Answer 8

so does ethyl alcohol, acetic acid, pyruvic acid, acetaldehyde, buytric acid (especially)

Answer 9

@shrutipande9

Answer 10

because saturated c-h bonds disperse the electronegativity equally making it nonpolar therefore hydrophobic

Answer 11

see even though all these molecules have C and H..having a ring structure makes the molecule most hydrophobic among all the other...now if u consider adenine its is even more hydrophobis than uracil because it is a 2 ring structure...

Answer 12

but then glucose has a ring structure, why is that still hydrophilic?
btw, thank you so much for all your help :)

Answer 13

umm..ill chek about this and den tell u...but i m sure the ans is uracil...ur welcome:)

Answer 14

okay, THANK YOU SO MUCH :DD

Answer 15

happy 2 help:D

Answer 16

oh, i think glucose would be hydrophilic because of all the hydroxide functional groups because OH bond is very polar

Answer 17

ahhhh...yes..u r right:)

Answer 18

however, online, it says that nulceic acids are polar

Answer 19

really?:O i need 2 chek..

Answer 20

The nucleic acids are polymeric macromolecules, or large biological molecules, essential for all known forms of life. Nucleic acids, which include DNA (deoxyribonucleic acid) and RNA (ribonucleic acid), are made from nucleotide monomers.
we were talking about uracil which is a nitrogen base.
nucleic acid as a whole macromolecule becomes polar due to its phosphate groups sticking out(especially in DNA).

Answer 21

Oh, so uracil is kind of the exception because of its nitrogen?

Answer 22

no no....see u r confusing between nucleic acids and nitrogen bases.

Answer 23

oh, im sorry, yea i think you are right

Answer 24

so just to be sure, nucleic acid is the nitrogenous base + sugar-phosphate backbone, right?

Answer 25

thats a nucleotide...nucleic acid is DNA and RNA...formed by joining of these nucleotides..

Answer 26

oh, okay thanks again

Answer 27

:D

Answer 28

it was butyric acid