Question

Assertion: Acetic acid does not undergo a haloform reaction.

Reason: Acetic acid has no alpha hydrogen atoms.

• A. The assertion is true, but the Reason is false.
• B. Both Assertion and Reason are false.
• C. Both Assertion and Reason are true. The reason is the correct explanation of the Assertion.
• D. Both Assertion and Reason are true. The reason is not the correct explanation for Assertion.

Answer 1

The correct option is A

The assertion is true, but the Reason is false.

Explanation for correct option:

(A) The assertion is true, but the Reason is false.

• Aldehydes and ketones can be tested for the presence of a ${\mathrm{CH}}_3\mathrm{CO}$ group using haloform.
• Because acetic acid behaves as an acid in the presence of ${\mathrm{OH}}^{-}$ ions and does not create ${\mathrm{CHX}}_3$ haloform, it does not undergo the haloform reaction.
• Therefore, the assertion is true. The acetic acid has three alpha hydrogens, the reason is false. Therefore, this is the correct option.

$$\begin{gathered} {\mathrm{CH}}_3\mathrm{COR}\left(\mathrm{aq}\right)+3{\mathrm{I}}_2\left(\mathrm{g}\right)+4{\mathrm{OH}}^{-}\left(\mathrm{aq}\right)\to {\mathrm{CHI}}_3\left(\mathrm{aq}\right)+{\mathrm{RCOO}}^{-}\left(\mathrm{aq}\right)+3{\mathrm{I}}^{-}\left(\mathrm{g}\right)+3{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right) \\ (\mathrm{Methyl}\mathrm{ketone})\left(\mathrm{Iodine}\right)(\mathrm{Hydroxide}\mathrm{ion})(\mathrm{Triiodo}\mathrm{methane}) \end{gathered}$$

Explanation for incorrect option:

(B) Both Assertion and Reason are false.

• The assertion Acetic acid does not undergo a haloform reaction is correct, the reason only incorrect. So, this is an incorrect option.

(C) Both Assertion and Reason are true. The reason is the correct explanation of the Assertion.

• The reason does not explain the assertion that acetic acid does not undergo reaction due to the presence of ${\mathrm{OH}}^{-}$ ions and does not create ${\mathrm{CHX}}_3$ haloform. So, this is an incorrect option.

(D) Both Assertion and Reason are true. The reason is not the correct explanation for Assertion.

• The assertion Acetic acid does not undergo a haloform reaction is correct, the reason only incorrect. So, this is an incorrect option.

Hence, the correct option is (A) The assertion is true, but the Reason is false.