JEE Main 2006 — Organic Chemistry

 The electrophile involved in the above reaction is

The increasing order of the rate of $\mathrm{HCN}$ addition to compounds $\mathrm{A}-\mathrm{D}$ is (A) $\mathrm{HCHO}$ (B) $\mathrm{CH}_3 \mathrm{COCH}_3$ (C) $\mathrm{PhCOCH}_3$ (D) PhCOPh


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

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

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

The term anomers of glucose refers to

Phenyl magnesium bromide reacts with methanol to give

The structure of the compound that gives a tribromo derivative on treatment with bromine water is

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

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

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) 

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

$$ \mathrm{CH}_3 \mathrm{Br}+\mathrm{Nu}^{-} \longrightarrow \mathrm{CH}_3-\mathrm{Nu}+\mathrm{Br}^{-} $$ 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 increasing order of stability of the following free radicals is

The structure of the major product formed in the following reaction is 

The pyrimidine bases present in DNA are