Organic Chemistry PYQ — Page 19

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): \(\mathrm{S}_{\mathrm{N}} 2\) reaction of \(\mathrm{C}_6 \mathrm{H}_5 \mathrm{CH}_2 \mathrm{Br}\) occurs more readily than the \(\mathrm{S}_{\mathrm{N}} 2\) reaction of \(\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{Br}\). Reason (R) : The partially bonded unhybridized p-orbital that develops in the trigonal bipyramidal transition state is stabilized by conjugation with the phenyl ring. In the light of the above statements, choose the most appropriate answer from the options given below :

Identify the product \((\mathrm{P})\) in the following reaction: 

Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R: Assertion A: Alcohols react both as nucleophiles and electrophiles. Reason R: Alcohols react with active metals such as sodium, potassium and aluminum to yield corresponding alkoxides and liberate hydrogen. In the light of the above statements, choose the correct answer from the options given below:

Identify $A$ and $B$ in the following reaction sequence. 

Among the following, total number of meta directing functional groups is (Integer based) $-{\mathrm{OCH}}_{3},-{\mathrm{NO}}_{2},-\mathrm{CN},-{\mathrm{CH}}_{3}-{\mathrm{NHCOCH}}_{3}$, $-\mathrm{COR},-\mathrm{OH},-\mathrm{COOH},-\mathrm{Cl}$

The adsorbent used in adsorption chromatography is/are - A. silica gel B. alumina C. quick lime D. magnesia Choose the most appropriate answer from the options given below :

Which among the following purification methods is based on the principle of “Solubility” in two different solvents?

Identify the major products \(\mathrm{A}\) and \(\mathrm{B}\) respectively in the following set of reactions. 

The arenium ion which is not involved in the bromination of Aniline is

The products A and B formed in the following reaction scheme are respectively 

In the Claisen-Schmidt reaction to prepare \(351 \mathrm{~g}\) of dibenzalacetone using \(87 \mathrm{~g}\) of acetone, the amount of benzaldehyde required is ______ g. (Nearest integer)

Given below are two statements : Statement I : Piciric acid is 2,4,6 - trinitrotoluene. Statement II : Phenol - 2,4 - disulphonic acid is treated with Conc. \(\mathrm{HNO}_3\) to get picric acid. In the light of the above statements, choose the most appropriate answer from the options given below :

Methods used for purification of organic compounds are based on :

In Kjeldahl's method for estimation of nitrogen, ${\mathrm{CuSO}}_{4}$ acts as :

A compound $(x)$ with molar mass $108g{\mathrm{mol}}^{-1}$ undergoes acetylation to give product with molar mass $192g{\mathrm{mol}}^{-1}$. The number of amino groups in the compound $(x)$ is ________.

Given below are two statements: Statement I: IUPAC name of $\mathrm{HO}-{\mathrm{CH}}_{2}-({\mathrm{CH}}_{2}{)}_{3}-{\mathrm{CH}}_{2}-{\mathrm{COCH}}_{3}$ is $7$-hydroxyheptan-$2$-one. Statement II: $2$-oxoheptan-$7$-ol is the correct IUPAC name for the above compound. In the light of the above statements, Choose the most appropriate answer from the options given below:

The incorrect statement regarding conformations of ethane is:

Number of compounds from the following which cannot undergo Friedel-Crafts reactions is: ________. toluene, nitrobenzene, xylene, cumene, aniline, chlorobenzene, \(m\)-nitroaniline, \(m\)-dinitrobenzene

Identify $A$ and $B$ in the following sequence of reaction 

Given below are two statements : Statement (I) : Kjeldahl method is applicable to estimate nitrogen in pyridine. Statement (II) : The nitrogen present in pyridine can easily be converted into ammonium sulphate in Kjeldahl method. In the light of the above statements, choose the correct answer from the options given below

 In the above chemical reaction sequence " \(\mathrm{A}\) " and " \(\mathrm{B}\) " respectively are

The technique used for purification of steam volatile water immiscible substance is:

Which among the following compounds will undergo fastest \(\mathrm{S}_{\mathrm{N}} 2\) reaction.

Identify the name reaction.