Organic Chemistry PYQ — Page 36

With respect to the following reaction, consider the given statements:  (A) $o$-Nitroaniline and $p$-nitroaniline are the predominant products. (B) $p$-Nitroaniline and $m$-nitroaniline are the predominant products. (C) ${\mathrm{HNO}}_{3}$ acts as an acid. (D) ${H}_{2}{\mathrm{SO}}_{4}$ acts as an acid. Choose the correct option.

A $100\mathrm{mL}$ solution of ${\mathrm{CH}}_{3}{\mathrm{CH}}_{2}\mathrm{MgBr}$ on treatment with methanol produces $2.24\mathrm{mL}$ of a gas at STP. The weight of gas produced is____mg (nearest integer)

Which of the following ketone will NOT give enamine on treatment with secondary amines? [where $t-\mathrm{Bu}$ is $-C{({\mathrm{CH}}_{3})}_{3}$]

Optical activity of an enantiomeric mixture is $+12.6^{\circ}$ and the specific rotation of $(+)$ isomer is $+30^{\circ}$. The optical purity is____$%$

In the given reaction,  The number of $\pi$ electrons present in the product $'P'$ is ____________.

Match List-I with List-II <table class="pyq-table"><tbody><tr><td></td><td>List-I (Mixture)</td><td></td><td>List-II (Purification Process)</td></tr><tr><td>A</td><td>Chloroform & Aniline</td><td>I</td><td>Steam distillation</td></tr><tr><td>B</td><td>Benzoic acid & Napthalene</td><td>II</td><td>Sublimation</td></tr><tr><td>C</td><td>Water & Aniline</td><td>III</td><td>Distillation</td></tr><tr><td>D</td><td>Napthalene & Sodium chloride</td><td>IV</td><td>Crystallisation</td></tr></tbody></table>

Match List-I with List-II <table class="pyq-table"><tbody><tr><td></td><td>List-I</td><td></td><td>List-II</td></tr><tr><td>A</td><td>Benzenesulphonyl chloride</td><td>I</td><td>Test for primary amines</td></tr><tr><td>B</td><td>Hoffmann bromamide reaction</td><td>II</td><td>Anti Saytzeff</td></tr><tr><td>C</td><td>Carbylamine reaction</td><td>III</td><td>Hinsberg reagent</td></tr><tr><td>D</td><td>Hoffmann orientation</td><td>IV</td><td>Known reaction of Isocyanates.</td></tr></tbody></table>Choose the correct answer from the options given below

The separation of two coloured substances was done by paper chromatography. The distances travelled by solvent front, substance $A$ and substance $B$ from the base line are $3.25\mathrm{cm}.2.08\mathrm{cm}$ and $1.05\mathrm{cm}$. respectively. The ratio of ${R}_{f}$ values of $A$ to $B$ is (Answer the nearest integer)

Given below are two statements : Statement I : On heating with ${\mathrm{KHSO}}_{4}$, glycerol is dehydrated and acrolein is formed. Statement II : Acrolein has fruity odour and can be used to test glycerol's presence. Choose the correct option.

An organic compound '$A$' on reaction with ${\mathrm{NH}}_{3}$ followed by heating gives compound $B$. Which on further strong heating gives compound $C$ $({C}_{8}{H}_{5}{\mathrm{NO}}_{2})$. Compound $C$ on sequential reaction with ethanolic $\mathrm{KOH}$, alkyl chloride and hydrolysis with alkali gives a primary amine. The compound $A$ is

Arrange the following carbocations in decreasing order of stability. 

The products formed in the following reaction, $A$ and $B$ are 

Among the following structures, which will show the most stable enamine formation? (Where $\mathrm{Me}$ is $-{\mathrm{CH}}_{3}$)

The formula of the purple colour formed in Laissaigne's test for sulphur using sodium nitroprusside is

Among the following marked proton of which compound shows lowest ${\mathrm{pK}}_{a}$ value?

In the given reaction  (Where Et is $-{C}_{2}{H}_{5}$) The number of chiral carbon/s in product $A$ is

Given below are two statements: one is labelled as Assertion and the other is labelled as Reason. Assertion: A mixture contains benzoic acid and napthalene. The pure benzoic acid can be separated out by the use of benzene. Reason: Benzoic acid is soluble in hot water. In the light of the above statements, choose the most appropriate answer from the options given below.

Given below are two statements: One is labelled as Assertion $A$ and the other is labelled as Reason $R$ Assertion $A$ : Thin layer chromatography is an adsorption chromatography. Reason $R$ : A thin layer of silica gel is spread over a glass plate of suitable size in thin layer chromatography which acts as an adsorbent. In the light of the above statements, choose the correct answer from the options given below

In the given reaction sequence, the major product '$C$' is : ${C}_{8}{H}_{10}\underset{{H}_{2}{\mathrm{SO}}_{4}}{\overset{{\mathrm{HNO}}_{3}}{\longrightarrow }}A\underset{\Delta }{\overset{{\mathrm{Br}}_{2}}{\longrightarrow }}B\underset{\mathrm{KOH}}{\overset{\mathrm{alcoholic}}{\longrightarrow }}C$

The structure of $A$ in the given reaction is 

Total number of isomers (including stereoisomers) obtain on monochlorination of methylcyclohexane is

Which one of the following compounds is inactive towards ${S}_{N}1$ reaction?

The major product $(P)$ in the reaction 

Consider the following reaction, $A\rightarrow _{\begin{matrix}2.{\mathrm{CN}}^{-} \\ 3.{H}_{2}O/{H}^{+}/\Delta \end{matrix}}^{1.{\mathrm{Cl}}_{2}/\mathrm{hv}}4-\mathrm{bromophenylacetic}\mathrm{acid}$ What is $A$ in the above reaction?