The tests performed on compound X and their i | vedclass

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Question

(B) The $2, 4-DNP$ test is positive for aldehydes and ketones,indicating the presence of a carbonyl group.The iodoform test is positive for methyl ket

Vedclass · Accepted Answer

$2-$(dimethylamino)acetophenone

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(B) The $2, 4-DNP$ test is positive for aldehydes and ketones,indicating the presence of a carbonyl group.The iodoform test is positive for methyl ketones $(-COCH_3)$ or compounds that can be oxidized to methyl ketones (like $CH_3CH(OH)-R$).The azo-dye test is used to detect primary aromatic amines. $A$ negative result indicates that the amine is either not primary or its reactivity is hindered.Option $(B)$ is $2-(dimethylamino)acetophenone$. It contains a $-COCH_3$ group,which gives a positive $2, 4-DNP$ test and a positive iodoform test. The nitrogen atom is tertiary (dimethylamino),so it does not form an azo-dye,consistent with the observations.

Test	Inference
$(a)$ $2, 4-DNP$ test	Coloured precipitate
$(b)$ Iodoform test	Yellow precipitate
$(c)$ Azo-dye test	No dye formation

List-$I$ (Reagents)	List-$II$ (Reaction Name)
$A$. $NH_2-NH_2, KOH$	$I$. Tollen's Test
$B$. $[Ag(NH_3)_2]OH$	$II$. Clemmensen Reduction
$C$. Aq. $CuSO_4$, Sodium Potassium tartarate, $KOH$	$III$. Wolff-Kishner Reduction
$D$. $Zn-Hg, HCl$	$IV$. Fehling's Test

The tests performed on compound $X$ and their inferences are:

Test Inference

$(a)$ $2, 4-DNP$ test Coloured precipitate

$(b)$ Iodoform test Yellow precipitate

$(c)$ Azo-dye test No dye formation

Compound $X$ is:

Similar Questions

Which one of the following on treatment with $50 \% \text{ aq. } NaOH$ yields the corresponding alcohol and salt of carboxylic acid?

Assertion : Hydroxyketones are not directly used in Grignard reaction.
Reason : Grignard reagents react with hydroxyl group.

Arrange the following compounds in the increasing order of their reactivity towards the nucleophilic addition of $HCN$:
$1. HCHO$
$2. CH_3COCH_3$
$3. PhCOCH_3$
$4. PhCOPh$

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The tests performed on compound $X$ and their inferences are: Test Inference $(a)$ $2, 4-DNP$ test Coloured precipitate $(b)$ Iodoform test Yellow precipitate $(c)$ Azo-dye test No dye formation Compound $X$ is: