JEE Main 2005 — Organic Chemistry

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

The reaction  is fastest when X is

The decreasing order of nucleophilicity among the nucleophiles 

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

2 methylbutane on reacting with bromine in the presence of sunlight gives mainly

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

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

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

Among the following acids which has the lowest $\mathrm{pK}_{\mathrm{a}}$ value

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

Amongst the following the most basic compound is

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

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

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

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

Acid catalyzed hydration of alkenes except ethene leads to the formation of

Alkyl halides react with dialkyl copper reagents to give

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