Biochemistry - Water, pH and Macromolecules - Discussion

Discussion :: Water, pH and Macromolecules - Section 1 (Q.No.12)

12. 

Which of the following alcohols would be most soluble in water?

[A]. methanol
[B]. ethanol
[C]. butanol
[D]. octanol

Answer: Option A

Explanation:

No answer description available for this question.

Khooshi Patel said: (Mar 4, 2014)  
Why only methanol soluble in water ? and why not any other alcohol not soluble in water.

Urooj said: (Mar 29, 2014)  
Why only methanol soluble in water ? and why not any other alcohol not soluble in water.

Sheela said: (Apr 28, 2014)  
Why only methanol soluble in water ? and why not any other alcohol not soluble in water.

Mazjobrani said: (Jun 1, 2014)  
The longer the carbon chain of the alcohol, the less soluble it is in polar solvents.

Naimish said: (Nov 6, 2014)  
SOLUBILITY DEPENDS ON THE CARBON NUMBER MORE CARBON NUMBER LESS SOLUBILITY VICE VERSA.

Ariel said: (Jun 4, 2015)  
More carbon less polar.

Ariel said: (Jun 4, 2015)  
More carbon less polar.

Abung Thoudam said: (Jul 28, 2015)  
All are the soluble in water but methanol is most soluble in water for others.

Patrick said: (Dec 21, 2016)  
The alcohol that is going to me MOST soluble is going to be the alcohol with the SHORTEST hydrocarbon chain. To understand this question conceptually, you have to think in terms of chemistry.

Water contains a partially negative charge on the oxygen, and a partially positive charge on the hydrogen, making water polar. These partial charges are what cause water to interact with other partially charged molecules; such as the hydroxyl group on an alcohol, to form hydrogen bonds. But the longer the hydrocarbon chain, the less water is going to have interacted with on the molecule.

In terms of electronegativity, carbon and hydrogen are nearly identical making them from very nonpolar bonds (so the is essentially no "tugging" on e-,or dipole moments). Remember water is polar, and that is why long hydrocarbon chains are essential for the lipid bilayers within cell membranes to form a barrier between a cells interior and environment.

Mamta Joshi said: (May 23, 2017)  
I agree with your answer, thanks @Patrick.

Rovert said: (Oct 17, 2017)  
Yeah, thanks @Patrick.

Edmyrmk said: (Jun 22, 2018)  
Thanks @Patrick.

Tonny said: (Apr 12, 2019)  
Thanks @Patrick.

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