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STD 12 - 10. Biomolecules — NEET STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceNEETSTD 12 - 10. Biomolecules4 Marks
MCQ
Assertion : Alpha $\left( \alpha  \right) - $ amino acids exist as internal salt in solution as they have amino and carboxylic acid groups in near vicinity.
Reason : $H^+$ ion given by carboxylic group $(-COOH)$ is captured by amino group $(-NH_2)$ having lone pair of electrons.
  • ✓
    If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
  • B
    If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
  • C
    If the Assertion is correct but Reason is incorrect.
  • D
    If both the Assertion and Reason are incorrect.
✓

Answer

Correct option: A.
If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
a
All $\alpha $ acids have $-\,NH_2$ and $-\,COOH$ groups. Since $-\,NH_2$ group is basic and $-\,COOH$ group is acidic., in neutral solution it exists as internal salt which is also called as zwitter ion. This zwitter ion is formed due to reason that proton of $-\,COOH$ group is transferred to $-\,NH_2$ group.

  $\mathop {\begin{array}{*{20}{c}}
  {R\,\,\,\,\,\,\,\,\,} \\ 
  {|\,\,\,\,\,\,\,\,\,\,} \\ 
  {{H_2}\ddot N - CH - COOH} 
\end{array}\,}\limits_{\alpha \, - \,amino\,\,acid} $ $\xrightarrow{{In\,\,water}}$

${\begin{array}{*{20}{c}}
  {R\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\ 
  {|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\ 
  {{H_2}\ddot N - CH - CO{O^ - } + {H^ + }} 
\end{array}}$ $\to $ $\underset{\begin{smallmatrix} 
 Zwitter\,\,ion \\ 
 (dipolar\,\,ion) 
\end{smallmatrix}}{\mathop{\begin{matrix}
   \,\,\,\,\,\,\,\,\,\,R\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,  \\
   \,\,\,\,\,\,\,\,\,\,\,|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,  \\
   {{H}_{3}}\ddot{N}-CH-CO{{O}^{-}}  \\
\end{matrix}\,}}\,$

Hence assertion and reason both are true and reson is the correct explanation of assertion.

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