MyQuestionIcon

1

You visited us 1 times! Enjoying our articles? Unlock Full Access!

Reimer Tiemann Reaction

An amino acid...

Question

An amino acid under certain conditions have both positive and negativ charges simultaneously in the same molecule. Such a form of amine acid is called

(a) acidic form (b) basic form

(c) aromatic form (d) zwitterionic form

Open in App

Solution

(d) A zwitterion is a neutral molecule having both the cationic and anionic charges on the same molecule, Amino acids are the best known examples of zwitterion.

In acidic solution's amino group accepts a hydrogen ion to become positively charges.whereas, in alkaline solution the carboxyl group donates a hydrogen ion to become negatively charged. The pH at which the amino acid is electrically neutral is called isoelectric pH.

$N H_{3} - R C H C a t i o n (l o w p H) ⇌^{+} R H_{3} N - C H - C O O^{-} (z w i t t e r i o n a t i s o e l e c t r i c p H) ⇌ H_{2} - N H_{3} - R C H A n i o n (h i g h p H)$

Suggest Corrections

thumbs-up

1

Similar questions

An amino acid under certain conditions have both positive and negative charges simultaneously in the same molecule. Such a form of amino acid is called

Q. Many organic substances are negatively charged Eg. Acetic acid, while others are positively charged eg. Ammonium ion. An amino acid under certain conditions would have both positive and negative charges simultaneously in the same molecule. Such a form of amino acid is called,

Q. Zwitterionic form of an Amino acid, is put into an acidic medium, then that structure will move towards which electrode in electric fields?

Q. The conditions under which amino acid molecules might have been become bonded together to form the first protein molecules was suggested by

Select the correct statements regarding zwitterion.

(i) Zwitterions can be formed from compounds that contain both acid groups and basic groups in their molecules.
(ii) A zwitterion can act either as a proton donor or proton acceptor.
(iii) A monoamine monocarboxylic

α

-amino acid is a acid at high pH as both the groups (amino and carboxyl) lose a proton.
(iv) Amino acids in solution at neutral pH exist predominantly as dipolar ions, the amino group is protonated

(N H_{3}^{+})

and the carboxyl group is deprotonated

(- C O O^{-})

.

View More

Join BYJU'S Learning Program

similar_icon

Related Videos

lock

Chemical Properties of Phenols

CHEMISTRY

Watch in App

explore_more_icon

Explore more

Reimer Tiemann Reaction

Standard XII Chemistry

Join BYJU'S Learning Program

CrossIcon