(A) The reaction sequence is as follows:$1$. Dehydrogenation of heptane $(P)$ using $Cr_2O_3$ at $770 \ K$ and $20 \ atm$ yields toluene.$2$. Etard re

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$(i) Cr_2O_3, 770 \ K, 20 \ atm$; $(ii) CrO_2Cl_2, H_3O^{+}$; $(iii) NaOH$; $(iv) H_3O^{+}$

(A) The reaction sequence is as follows:$1$. Dehydrogenation of heptane $(P)$ using $Cr_2O_3$ at $770 \ K$ and $20 \ atm$ yields toluene.$2$. Etard reaction of toluene with $CrO_2Cl_2$ followed by hydrolysis gives benzaldehyde.$3$. Benzaldehyde undergoes Cannizzaro reaction with $NaOH$ to form sodium benzoate and benzyl alcohol.$4$. Acidification with $H_3O^{+}$ converts sodium benzoate to benzoic acid $(Q)$ and leaves benzyl alcohol $(R)$.

Class 12 Chemistry 1 Aldehydes, Ketones and Carboxylic Acids: Aldehydes and Ketones Properties

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The correct sequence of reagents for the preparation of $Q$ and $R$ is:

JEE MAIN 2023 All JEE MAIN

A
$(i) Cr_2O_3, 770 \ K, 20 \ atm$; $(ii) CrO_2Cl_2, H_3O^{+}$; $(iii) NaOH$; $(iv) H_3O^{+}$
B
$(i) CrO_2Cl_2, H_3O^{+}$; $(ii) Cr_2O_3, 770 \ K, 20 \ atm$; $(iii) NaOH$; $(iv) H_3O^{+}$
C
$(i) KMnO_4, OH^{-}$; $(ii) Mo_2O_3, \Delta$; $(iii) NaOH$; $(iv) H_3O^{+}$
D
$(i) Mo_2O_3, \Delta$; $(ii) CrO_2Cl_2, H_3O^{+}$; $(iii) NaOH$; $(iv) H_3O^{+}$

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1 Aldehydes, Ketones and Carboxylic Acids: Aldehydes and Ketones

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The molecular formula of compound $A$ is $C_2Cl_3OH$. It reduces Fehling's solution and on oxidation gives a monocarboxylic acid $B$. Compound $A$ is obtained by the reaction of chlorine with ethyl alcohol. What is $A$?

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The product of the reaction between ammonia and formaldehyde is

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Which of the following will give $-ve$ Tollen's but $+ve$ Iodoform test?

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Match the reactions given in Column-$I$ with the suitable reagents given in Column-$II$.

Column-$I$ (Reactions) Column-$II$ (Reagents)

$(A).$ Benzophenone $\to$ Diphenylmethane $(1).$ $LiAlH_4$

$(B).$ Benzaldehyde $\to$ $1-$Phenylethanol $(2).$ $DiBAL-H$

$(C).$ Cyclohexanone $\to$ Cyclohexanol $(3).$ $Zn(Hg) / \text{Conc. } HCl$

$(D).$ Phenyl benzoate $\to$ Benzaldehyde $(4).$ $CH_3MgBr$

Column-$I$ (Reactions)	Column-$II$ (Reagents)
$(A).$ Benzophenone $\to$ Diphenylmethane	$(1).$ $LiAlH_4$
$(B).$ Benzaldehyde $\to$ $1-$Phenylethanol	$(2).$ $DiBAL-H$
$(C).$ Cyclohexanone $\to$ Cyclohexanol	$(3).$ $Zn(Hg) / \text{Conc. } HCl$
$(D).$ Phenyl benzoate $\to$ Benzaldehyde	$(4).$ $CH_3MgBr$