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8.1. Aldehydes and ketones — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistry8.1. Aldehydes and ketones1 Mark
MCQ
Assertion : Acetamide has more polar $\begin{matrix}
   \backslash   \\
   /  \\
\end{matrix}C=O$ group than ethyl acetoacetate.

Reason : $\overset{\centerdot \,\,\centerdot }{\mathop{N}}\,{{H}_{2}}$ is more electron donating than $\overset{\centerdot \,\centerdot \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}{\mathop{O{{C}_{2}}{{H}_{5}}}}\,$

  • ✓
    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
$\underset{Acetamide}{\mathop{\begin{matrix}
   O  \\
   ||  \\
   C{{H}_{3}}-C-\ddot{N}{{H}_{2}}  \\
\end{matrix}}}\,$

$\underset{Ethyl\,\,acetoacetate}{\mathop{\begin{matrix}
   \,\,\,\,\,O\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,O  \\
   \,\,\,\,\,\,||\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,||  \\
   {{C}_{2}}{{H}_{5}}\ddot{O}-C-C{{H}_{2}}-C-C{{H}_{3}}  \\
\end{matrix}}}\,$

$\mathrm{As}-\mathrm{NH}_{2}$ is more basic than $\mathrm{RO}^{-}$ hence acetamide has more polar $\begin{matrix}
   \backslash   \\
   /  \\
\end{matrix}C=O$ group than $\mathrm{OC}_{2} \mathrm{H}_{5}$ group in ethyl acetoacetate.

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

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