Organic Chemistry PYQ — Page 43

Benzene on nitration gives nitrobenzene in presence of ${\mathrm{HNO}}_{3}$ and ${H}_{2}{\mathrm{SO}}_{4}$ mixture, where:

Given below are two statements : Statement I : Hyperconjugation is a permanent effect. Statement II : Hyperconjugation in ethyl cation $({\mathrm{CH}}_{3}-\overset{+}{C}{H}_{2})$ involves the overlapping of ${C}_{{\mathrm{sp}}^{2}}-{H}_{1s}$ bond with empty $2p$ orbital of other carbon. Choose the correct option:

Which of the glycosidic linkage between galactose and glucose is present in lactose?

The number of compound/s given below which contain/s $-\mathrm{COOH}$ group is ___ . (Integer answer) (A) Sulphanilic acid (B) Picric acid (C) Aspirin (D) Ascorbic acid

The major product of the following chemical reaction is : 

A chloro compound "A". (i) forms aldehydes on ozonolysis followed by the hydrolysis. (ii) when vaporized completely $1.53g$ of $A$, gives $448\mathrm{mL}$ of vapour at STP. The number of carbon atoms in a molecule of compound $A$ is

The major product of the following reaction is : 

Reagent, $1-$naphthylamine and sulphanilic acid in acetic acid is used for the detection of

The major product formed in the following reaction is: 

Which of the following is a FALSE statement?

 Considering the above chemical reaction, identify the product $X:$

Which of the following compounds will provide a tertiary alcohol on reaction with excess of ${\mathrm{CH}}_{3}\mathrm{MgBr}$ followed by hydrolysis ?

Among the following compounds $I-\mathrm{IV},$ which one forms a yellow precipitate on reacting sequentially with (i) $\mathrm{NaOH}$ (ii) dil. ${\mathrm{HNO}}_{3}$ (iii) ${\mathrm{AgNO}}_{3}?$ 

$\underset{({C}_{4}{H}_{8}{\mathrm{Cl}}_{2})}{A}\rightarrow _{373K}^{\mathrm{Hydrolysis}}\underset{({C}_{4}{H}_{8}O)}{B}$ $B$ reacts with Hydroxyl amine but does not give Tollen's test. Identify $A$ and $B$.

Match List - I with List - II. <table class="pyq-table"><tbody><tr><td></td><td>List - I (Chemical Reaction)</td><td></td><td>List - II (Reagent used)</td></tr><tr><td>a</td><td>${\mathrm{CH}}_{3}{\mathrm{COOCH}}_{2}{\mathrm{CH}}_{3}\rightarrow {\mathrm{CH}}_{3}{\mathrm{CH}}_{2}\mathrm{OH}$</td><td>i</td><td>${\mathrm{CH}}_{3}\mathrm{MgBr}/{H}_{3}{O}^{+}$ (one equivalent)</td></tr><tr><td>b</td><td>${\mathrm{CH}}_{3}{\mathrm{COOCH}}_{3}\rightarrow {\mathrm{CH}}_{3}\mathrm{CHO}$</td><td>ii</td><td>${H}_{2}{\mathrm{SO}}_{4}/{H}_{2}O$</td></tr><tr><td>c</td><td>${\mathrm{CH}}_{3}C\equiv N\rightarrow {\mathrm{CH}}_{3}\mathrm{CHO}$</td><td>iii</td><td>$\mathrm{DIBAL}-H/{H}_{2}O$</td></tr><tr><td>d</td><td><img src="https://prepforbharat.s3.ap-south-1.amazonaws.com/exam/615f0e999476412f48314daf/Chemistry/images/Carboxylic_Acid_Derivatives/648b5a6b417cc3fb48d6742a/question_1__q_648b5a6b417cc3fb48d6742a__cdn-question-pool.getmarks.app__ecb288d8-1f93-45c7-a4cf-d323dfa28a37-image__22aa15a4d6_final_ppt_sync.png" alt="JEE Main 2021 Chemistry, Carboxylic Acid Derivatives — question figure"></td><td>iv</td><td>${\mathrm{SnCl}}_{2},\mathrm{HCl}/{H}_{2}O$</td></tr></tbody></table>Choose the most appropriate match.

The structures of $A$ and $B$ formed in the following reaction are : $[\mathrm{Ph}=-{C}_{6}{H}_{5}]$ 

The number of nitrogen atoms in a semicarbazone molecule of acetone is_____

Hoffmann bromamide degradation of benzamide gives product $A,$ which upon heating with ${\mathrm{CHCl}}_{3}$ and $\mathrm{NaOH}$ gives product $B.$ The structures of $A$ and $B$ are:

Presence of which reagent will affect the reversibility of the following reaction, and change it to a irreversible reaction : $C{H}_{4}+{I}_{2}\rightleftharpoons _{\mathrm{Reversible}}^{\mathrm{hv}}{\mathrm{CH}}_{3}-I+\mathrm{HI}$

Which one of the following is the major product of the given reaction? 

Which of the following is NOT an example of fibrous protein ?

Which one of the following compounds will give orange precipitate when treated with $2,4-$dinitrophenyl hydrazine ?

Choose the correct name for compound given below : 

Given below are two statements : Statement I : Ethyl pent-$4$-yn-oate on reaction with ${\mathrm{CH}}_{3}\mathrm{MgBr}$ gives a $3^{\circ}$-alcohol. Statement II : In this reaction one mole of ethyl pent-$4$-yn-oate utilizes two moles of ${\mathrm{CH}}_{3}\mathrm{MgBr}$. In the light of the above statements, choose the most appropriate answer from the options given below :