Organic Chemistry PYQ — Page 27

 ‘$A$’ formed in the above reaction is

Find out the major product from the following reaction. 

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R. Assertion A : Order of acidic nature of the following compounds is $A>B>C$.  Reason R: Fluoro is a stronger electron withdrawing group than Chloro group. In the light of the above statements, choose the correct 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 : Benzene is more stable than hypothetical cyclohexatriene. Reason R : The delocalized $\pi$ electron cloud is attracted more strongly by nuclei of carbon atoms. In the light of the above statements, choose the correct answer from the options given below:

Resonance in carbonate ion $({\mathrm{CO}}_{3}^{2-})$ is  Which of the following is true?

Match List-I with List-II. <table class="pyq-table"><tbody><tr><td colspan="2" rowspan="1">List-I Element detected</td><td colspan="2" rowspan="1">List-II Reagent used/Product formed</td></tr><tr><td>$A$</td><td>Nitrogen</td><td>$I$</td><td>${\mathrm{Na}}_{2}[\mathrm{Fe}{(\mathrm{CN})}_{5}\mathrm{NO}]$</td></tr><tr><td>$B$</td><td>Sulphur</td><td>$\mathrm{II}$</td><td>${\mathrm{AgNO}}_{3}$</td></tr><tr><td>$C$</td><td>Phosphorus</td><td>$\mathrm{III}$</td><td>${\mathrm{Fe}}_{4}{[\mathrm{Fe}{(\mathrm{CN})}_{6}]}_{3}$</td></tr><tr><td>$D$</td><td>Halogen</td><td>$\mathrm{IV}$</td><td>${({\mathrm{NH}}_{4})}_{2}{\mathrm{MoO}}_{4}$</td></tr></tbody></table>Choose the correct answer from the options given below:

Match List I with List II. Choose the correct answer from the options given below :- <table class="pyq-table"><tbody><tr><td></td><td>List I Isomeric pairs</td><td></td><td>List II Type of isomers</td></tr><tr><td>A</td><td>Propanamine and N- Methylethanamine</td><td>I</td><td>Metamers</td></tr><tr><td>B</td><td>Hexan-2-one Hexan-3-one</td><td>II</td><td>Positional isomers</td></tr><tr><td>C</td><td>Ethanamide and Hydroxyethanimine</td><td>III</td><td>Functional isomers</td></tr><tr><td>D</td><td>o-nitrophenol and pnitrophenol</td><td>IV</td><td>Tautomers</td></tr></tbody></table>

In Dumas method for the estimation of ${N}_{2}$, the sample is heated with copper oxide and the gas evolved is passed over:

Decreasing order towards ${S}_{N}1$ reaction for the following compounds is: 

Using column chromatography, mixture of two compounds ‘$A$’ and ‘$B$’ was separated. ‘$A$’ eluted first, this indicates ‘$B$’ has

Identify the correct order of reactivity for the following pairs towards the respective mechanism (A)  (B)  (C) Electrophilic substitution  (D) Nucleophilic substitution  Choose the correction answer from the options given below:

Number of bromo derivatives obtained on treating ethane with excess of ${\mathrm{Br}}_{2}$ in diffused sunlight is $_________$

Match items of column I and II <table class="pyq-table"><tbody><tr><td>Column I (Mixture of compounds)</td><td>Column II (Separation Technique)</td></tr><tr><td>A. ${H}_{2}O/{\mathrm{CH}}_{2}{\mathrm{Cl}}_{2}$</td><td>i. Crystallization</td></tr><tr><td>B. <img src="https://prepforbharat.s3.ap-south-1.amazonaws.com/exam/615f0e999476412f48314daf/Chemistry/images/General_Organic_Chemistry/648b5a70417cc3fb48d682a2/question_1__q_648b5a70417cc3fb48d682a2__cdn-question-pool.getmarks.app__5e082b5c-afbf-4440-b682-999f3a210bc5-9896029__4fbc32c1e9_final_ppt_sync.png" alt="JEE Main 2023 Chemistry, General Organic Chemistry — question figure"></td><td>ii. Differential solvent extraction</td></tr><tr><td>C. Kerosene/Naphthalene</td><td>iii. Column chromatography</td></tr><tr><td>D. ${C}_{6}{H}_{12}{O}_{6}/\mathrm{NaCl}$</td><td>iv. Fractional Distillation</td></tr></tbody></table>

The compound which will have the lowest rate towards nucleophilic aromatic substitution on treatment with ${\mathrm{OH}}^{–}$ is

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): Ketoses give Seliwanoff’s test faster than Aldoses. Reason (R): Ketoses undergo $\beta$-elimination followed by formation of furfural. In the light of the above statements, choose the correct answer from the options given below:

Increasing order of stability of the resonance structure is: 

A short peptide on complete hydrolysis produces $3$ moles of glycine $(G)$, two moles of leucine $(L)$ and two moles of valine $(V)$ per mole of peptide. The number of peptide linkages in it are _____ .

Reaction of propanamide with ${\mathrm{Br}}_{2}/\mathrm{KOH}$ (aq) produces:

The increasing order of ${\mathrm{pK}}_{a}$ for the following phenols is (A) 2,4-Dinitrophenol (B) 4-Nitrophenol (C) 2,4,5-Trimethylphenol (D) Phenol (E) 3-Chlorophenol Choose the correct answer from the option given below :

In SN2 reactions, the rate of reaction depends on:

How many of the transformation given below would result in aromatic amines? 

The product formed in the following multistep reaction is: 

The decreasing order of hydride affinity for following carbocations is: (a)  (2)  (3)  (4)  Choose the correct answer from the options given below:

The naturally occurring amino acid that contains only one basic functional group in its chemical structure is