Given below are the four isomeric compounds ( | vedclass

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Question

(A) The structures are: $P$ ($1$-phenylprop$-2-$en$-1-$ol),$Q$ ($3$-phenylpropanal),$R$ ($1$-phenylpropan$-2-$one),$S$ ($1$-phenylpropan$-1-$one).$A$.

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$A, C$ and $E$ only

Vedclass · Answer

(A) The structures are: $P$ ($1$-phenylprop$-2-$en$-1-$ol),$Q$ ($3$-phenylpropanal),$R$ ($1$-phenylpropan$-2-$one),$S$ ($1$-phenylpropan$-1-$one).$A$. $2,4-DNP$ reacts with aldehydes and ketones. $Q$ (aldehyde),$R$ (ketone),and $S$ (ketone) give the test. Statement $A$ is correct.$B$. Bayer's test is for unsaturation. Only $P$ has a double bond. Statement $B$ is incorrect.$C$. Aromatic compounds give a sooty flame. All four compounds contain a phenyl ring,so all give a sooty flame. Statement $C$ is technically correct,but we evaluate based on the options provided.$D$. $I_2/NaOH$ (Iodoform test) requires a $CH_3CO-$ group or $CH_3CH(OH)-$ group. $R$ has $CH_3CO-$ and $S$ does not. Statement $D$ is incorrect.$E$. Tollen's reagent is for aldehydes. Only $Q$ is an aldehyde. Statement $E$ is correct.Combining the correct statements $A, C, E$,the correct option is $A$.

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