Question

Which one in each of the following pairs is expected to exhibit hydrogen bonding?

• A. ${CH}_3{CH}_{2}OH$ and ${CH}_{3}O{CH}_3$
• B. ${CH}_3{NH}_2$ and ${CH}_{3}SH$
• C. ${CH}_{3}OH$ and ${\left({CH}_3\right)}_{3}N$
• D. None of the above

Answer 1

Answer: (C)

${CH}_{3}OH$ and ${\left({CH}_3\right)}_{3}N$

The two conditions given for hydrogen bonding are:

1) A hydrogen atom must be covalently bonded to O, N or F atom. We can understand this part, as O, N and F are highly electronegative and will leave the H with a positive dipole (more or less a H+ ion).

2) The other condition is that the atom with a lone pair which the H is hydrogen-bonded to must be O, N or F.

• In the given options option C satisfies both the conditions and hence is the correct answer.