Organic Chemistry PYQ — Page 42

 Consider the given reaction, the product '$X$' is:

Given below are two statements: Statement-I : $2$ -methylbutane on oxidation with ${\mathrm{KMnO}}_{4}$ gives $2$ -methylbutan-$2$-ol. Statement-II : $n$ -alkanes can be easily oxidised to corresponding alcohol with ${\mathrm{KMnO}}_{4}$. Choose the correct option :

The correct sequence of reagents used in the preparation of $4$ -bromo-$2$-nitroethylbenzene from benzene is :

Which one among the following resonating structures is not correct?

Match List-$I$ with List-$\mathrm{II}$. <table class="pyq-table"><tbody><tr><td colspan="2" rowspan="1">List-$I$</td><td colspan="2" rowspan="1">List-$\mathrm{II}$</td></tr><tr><td>(a)</td><td><img src="https://prepforbharat.s3.ap-south-1.amazonaws.com/exam/615f0e999476412f48314daf/Chemistry/images/Haloalkanes_and_Haloarenes/648b5a6b417cc3fb48d674df/question_1__q_648b5a6b417cc3fb48d674df__cdn-question-pool.getmarks.app__d25a9af9-a4b5-4899-81c1-56eef1eec907-image__aee5241e95_final_ppt_sync.png" alt="JEE Main 2021 Chemistry, Haloalkanes and Haloarenes — question figure 1"></td><td>(i)</td><td>Wurtz reaction</td></tr><tr><td>(b)</td><td><img src="https://prepforbharat.s3.ap-south-1.amazonaws.com/exam/615f0e999476412f48314daf/Chemistry/images/Haloalkanes_and_Haloarenes/648b5a6b417cc3fb48d674df/question_2__q_648b5a6b417cc3fb48d674df__cdn-question-pool.getmarks.app__e8fe2604-80bb-4611-a19e-3d75e4eaad8e-image__2c706b28d9_final_ppt_sync.png" alt="JEE Main 2021 Chemistry, Haloalkanes and Haloarenes — question figure 2"></td><td>(ii)</td><td>Sandmeyer reaction</td></tr><tr><td>(c)</td><td>$2{\mathrm{CH}}_{3}{\mathrm{CH}}_{2}\mathrm{Cl}+2\mathrm{Na}\overset{\mathrm{Ether}}{\longrightarrow }{C}_{2}{H}_{5}-{C}_{2}{H}_{5}+2\mathrm{NaCl}$</td><td>(iii)</td><td>Fittig reaction</td></tr><tr><td>(d)</td><td>$2{C}_{6}{H}_{5}\mathrm{Cl}+2\mathrm{Na}\overset{\mathrm{Ether}}{\longrightarrow }{C}_{6}{H}_{5}-{C}_{6}{H}_{5}+2\mathrm{NaCl}$</td><td>(iv)</td><td>Gatterman reaction</td></tr></tbody></table>Choose the correct answer from the options given below:

 The correct order of stability of given carbocation is:

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 : 

The major product of the following reaction is : 

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) ${\mathrm{AgNO}}_{3}?$ 

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 ?

An organic compound '$A$' ${C}_{4}{H}_{8}$on treatment with ${\mathrm{KMnO}}_{4}/{H}^{+}$ yields compound '$B$' ${C}_{3}{H}_{6}O$. Compound '$A$' also yields compound '$B$' an ozonolysis. Compound '$A$' is :

$\underset{({C}_{4}{H}_{8}{\mathrm{Cl}}_{2})}{A}\rightarrow _{373K}^{\mathrm{Hydrolysis}}\underset{({C}_{4}{H}_{8}O)}{B}$ $B$ 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.

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:

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

The structure of product $C,$ formed by the following sequence of reactions is : ${\mathrm{CH}}_{3}\mathrm{COOH}+{\mathrm{SOCl}}_{2}\longrightarrow A\rightarrow _{{\mathrm{AlCl}}_{3}}^{\mathrm{Benzene}}\longrightarrow B\rightarrow _{-\mathrm{OH}}^{\mathrm{KCN}}\longrightarrow C$

The product formed in the first step of the reaction of with excess $\mathrm{Mg}/{\mathrm{Et}}_{2}O(\mathrm{Et}={C}_{2}{H}_{5})$ is

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