Organic Chemistry PYQ — Page 72

$$ \mathrm{CH}_3 \mathrm{Br}+\mathrm{Nu}^{-} \longrightarrow \mathrm{CH}_3-\mathrm{Nu}+\mathrm{Br}^{-} $$ The decreasing order of the rate of the above reaction with nucleophiles $\left(\mathrm{Nu}^{-}\right) \mathrm{A}$ to $\mathrm{D}$ is $\left[\mathrm{Nu}^{-}=(\mathrm{A}) \mathrm{PhO}^{-}\right.$, (B) $\mathrm{AcO}^{-}$, (C) $\mathrm{HO}^{-}$, (D) $\left.\mathrm{CH}_3 \mathrm{O}^{-}\right]$

The correct order of increasing acid strength of the compounds is (a) $\mathrm{CH}_3 \mathrm{CO}_2 \mathrm{H}$ (b) $\mathrm{MeOCH}_2 \mathrm{CO}_2 \mathrm{H}$ (c) $\mathrm{CF}_3 \mathrm{CO}_2 \mathrm{H}$ (d) 

$\mathrm{HBr}$ reacts with $\mathrm{CH}_2=\mathrm{CH}-\mathrm{OCH}_3$ under anhydrous conditions at room temperature to give

Reaction of trans-2-phenyl-1-bromocyclopentane on reaction with alcoholic KOH produces

Phenyl magnesium bromide reacts with methanol to give

 The alkene formed as a major product in the above elimination reaction is


 The electrophile involved in the above reaction is

Increasing order of stability among the three main conformations (i.e. Eclipse, Anti, Gauche) of 2-fluoroethanol is

Fluorobenzene $\left(\mathrm{C}_6 \mathrm{H}_5 \mathrm{~F}\right)$ can be synthesized in the laboratory

Among the following the one that gives positive iodoform test upon reaction with $\mathrm{I}_2$ and $\mathrm{NaOH}$ is

Which types of isomerism is shown by 2,3-dichlorobutane?

Which one of the following methods is neither meant for the synthesis nor for separation of amines?

The reaction  is fastest when X is

The decreasing order of nucleophilicity among the nucleophiles 

The best reagent to convert pent -3- en-2-ol into pent -3-en-2-one is

Tertiary alkyl halides are practically inert to substitution by $\mathrm{S}_{\mathrm{N}}{ }^2$ mechanism because of

Reaction of one molecule of $\mathrm{HBr}$ with one molecule of 1,3 -butadiene at $40^{\circ} \mathrm{C}$ gives predominantly

Reaction of cyclohexanone with dimethylamine in the presence of catalytic amount of an acid forms a compound if water during the reaction is continuously removed. The compound formed is generally known as

p-cresol reacts with chloroform in alkaline medium to give the compound A which adds hydrogen cyanide to form, the compound B. The latter on acidic hydrolysis gives chiral carboxylic acid. The structure of the carboxylic acid is

Of the five isomeric hexanes, the isomer which can give two monochlorinated compounds is

In both DNA and RNA, heterocyclic base and phosphate ester linkages are at-

Elimination of bromine from 2-bromobutane results in the formation of-

Due to the presence of an unpaired electron, free radicals are: