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MODEL PAPER 9 — Chemistry STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 ScienceChemistryMODEL PAPER 91 Mark
Question
Assertion (A): At isoelectric point, the amino group does not migrate under the influence of electric field.
Reason (R): At isoelectric point, amino acid exists as a zwitterion.
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Answer

(a) Both A and R are true and R is the correct explanation of A.
Explanation: The high degree of polarity in HX as well as in carbonyl bond shows the easy addition of HX on carbonyl bond but as soon as the addition products are formed, the products loses HX to show the backward reaction.

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