Organic Chemistry PYQ — Page 42

An organic compound $A({C}_{6}{H}_{6}O)$ gives dark green colouration with ferric chloride. On treatment with ${\mathrm{CHCl}}_{3}$ and $\mathrm{KOH},$ followed by acidification gives compound $B.$ Compound $B$ can also be obtained from compound $C$ on reaction with pyridinium chlorochromate (PCC). Identify $A,B$ and $C.$

The correct decreasing order of densities of the following compounds is : 

 Consider the above reaction and identify the Product $P$ :

An amine on reaction with benzenesulphonyl chloride produces a compound insoluble in alkaline solution. This amine can be prepared by ammonolysis of ethyl chloride. The correct structure of amine is:

Which one of the following compounds is aromatic in nature?

 The product "A" in the above reaction is:

The potassium ferrocyanide solution gives a Prussian blue colour, when added to :

A. Phenyl methanamine B. $N,N$-Dimethylaniline C. $N$-Methyl aniline D. Benzenamine Choose the correct order of basic nature of the above amines.

What is $'X'$ in the given reaction? 

Which one of the following is correct structure for cytosine ?

The water soluble protein is:

Given below are two statements : Statement $I$ : The nucleophilic addition of sodium hydrogen sulphite to an aldehyde or a ketone involves proton transfer to form a stable ion. Statement $\mathrm{II}$ : The nucleophilic addition of hydrogen cyanide to an aldehyde or a ketone yields amine as final product. In the light of the above statements, choose the most appropriate answer from the options given below :

For the given reaction:  What is $A$?

The major products $A$ and $B$ formed in the following reaction sequence are : 

 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?

Which among the following is the strongest acid?

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:

Reaction of Grignard reagent, ${C}_{2}{H}_{5}\mathrm{MgBr}$ with ${C}_{8}{H}_{8}O$ followed by hydrolysis gives compound $A$, which reacts instantly with Lucas reagent to give compound $B({C}_{10}{H}_{13}\mathrm{Cl}).$ The Compound $B$ is:

 The correct order of stability of given carbocation is:

The correct sequential addition of reagents in the preparation of $3-$nitrobenzoic acid from benzene is:

A peptide synthesized by the reactions of one molecule each of Glycine, Leucine, Aspartic acid and Histidine will have _____ peptide linkages.