Assertion : $α -$ amino acids exist as dipolar ions or zwitter ions
Reason : $α -$ amino acids are the building blocks of proteins

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If both assertion and reason are true and the reason 1s the correct explanation of the: assertion

If both assertion and reason are true but reason is not the correct explanaction of the assertion

lf assertion is true but reason is false

If the assertion and reason both are false

answer is B.

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Detailed Solution

In acidic medium -COOH group acts as the base and accepts a proton. As a result, $α$ -amino acids exist as cations in acid medium and migrate towards cathode under the influence of an electric field.

In alkaline ·I medium $N H_{3}$ group acts as the acid and thus loses a proton. As a result, a-amino acids exist as anion and migrate. towards anode under the influence of an electric field.

However at some intermediate value of pH, be concentration of cationic form and anionic form will become equal and hence there is no net migration of $α$ - amino acid under the influence of an electric field.

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