Organic Chemistry Questions

Assertion : Cyclopentadienyl anion is much more stable than allyl anion.Reason : Cyclopentadienyl anion is aromatic in character.

Which of the following represents the correct order of the acidity in the given compounds?

If there is no rotation of plane polarized light by a compound in a specific solvent, thought to be chiral, it may mean that:

${\text{CH}}_3{\text{—CHCl—CH}}_2{\text{—CH}}_3$ has a chiral center. Which one of the following represents its $R$ configuration?

Which one of the following on reduction with lithium aluminium hydride yields a secondary amine?

Reduction of aldehydes and ketones into hydrocarbons using zinc amalgam and conc. $\text{HCl}$ is called:

For the following anions: (i) ${\text{I}}^{-}$, (ii) ${\text{Cl}}^{-}$, (iii) ${\text{Br}}^{-}$. (Question implies adding (iv) ${\text{F}}^{-}$ based on options). The increasing order of nucleophilicity in a polar protic solvent would be:

The product formed in aldol condensation is:

The order of decreasing reactivity towards an electrophilic reagent for the following: (i) Benzene, (ii) Toluene, (iii) Chlorobenzene, and (iv) Phenol would be:

In the hydrocarbon ${\text{CH}}_3-\text{CH}=\text{CH}-{\text{CH}}_2-\text{C}\equiv \text{CH}$, the state of hybridization of carbons 1, 3 and 5 are:

3-Phenylpropene on reaction with $\text{HBr}$ gives (as a major product):

Which amongst the following is the most stable carbocation ?

Products of the following reaction :

Aniline in a set of reactions yielded a product D.
The structure of the product D would be :

In a set of reactions, acetic acid yielded a product D.
The structure of D would be :

The major organic product formed from the following reaction :

Which of the following gives propyne on hydrolysis?

The major product formed in the following reaction is:

The major product obtained on treatment of ${\text{CH}}_3{\text{CH}}_2{\text{CH(F)CH}}_3$ with ${\text{CH}}_3{\text{O}}^{-}/{\text{CH}}_3\text{OH}$ is:

Among the following the most stable compound is:

A strong base can abstract an $\alpha$ -hydrogen from:

${\text{CH}}_3{\text{CO}}_2{\text{C}}_2{\text{H}}_5$ on reaction with sodium ethoxide in ethanol gives $A$, which on heating in the presence of acid gives $B$. Compound $B$ is:

Among the following which one does not act as an intermediate in Hofmann rearrangement?

Pyridine is less basic than triethylamine because:

Correct configuration of the following is:

${\text{C}}_6{\text{H}}_5{\text{CONHCH}}_3$ can be converted into ${\text{C}}_6{\text{H}}_5{\text{CH}}_2{\text{NHCH}}_3$ by:

Assertion : Rate of hydrolysis of methyl chloride to methanol is higher in $\text{DMF}$ than in water.Reason : Hydrolysis of methyl chloride follows second order kinetics.

Assertion : Rates of nitration of benzene and hexadeuterobenzene are different.Reason : $\text{C}-\text{H}$ bond is stronger than $\text{C}-\text{D}$ bond.

Assertion : $t$ -Butyl methyl ether is not prepared by the reaction of $t$ -butyl bromide with sodium methoxide.Reason : Sodium methoxide is a strong nucleophile.

Assertion : Alkyl isocyanides in acidified water give alkyl formamides.Reason : In isocyanides, carbon first acts as a nucleophile and then as an electrophile.

Which of the following statements about primary amines is ‘False’?

Trichloroacetaldehyde, ${\text{CCl}}_3\text{CHO}$ reacts with chlorobenzene in presence of sulphuric acid and produces:

Aniline in a set of the following reactions yielded a coloured product Y: The structure of Y would be:

The reaction of toluene with ${\text{Cl}}_2$ in presence of ${\text{FeCl}}_3$ gives $X$ and reaction in presence of light gives $Y$. Thus, $X$ and $Y$ are:

Liquid hydrocarbons can be converted to a mixture of gaseous hydrocarbons by:

In a set of reactions, ethyl benzene yielded a product D: would be:

Which one is most reactive towards $S_{N}1$ reaction?

Which one is most reactive towards electrophilic reagent?

Which one of the following compounds has the most acidic nature?

Given are cyclohexanol (I), acetic acid (II), 2, 4, 6-trinitrophenol (III) and phenol (IV). In these the order of decreasing acidic character will be:

Nitrobenzene can be prepared from benzene by using a mixture of conc. ${\text{HNO}}_3$ and conc. ${\text{H}}_2{\text{SO}}_4$. In this mixture, nitric acid acts as a/an:

Acetamide is treated with the following reagents separately. Which one of these would yield methyl amine?

Which of the following reactions will not result in the formation of carbon-carbon bonds?

In the following, the most stable conformation of n-butane is:

The correct order of increasing reactivity of $\text{C-X}$ bond towards nucleophile in the following compound is:

Among the given compounds, the most susceptible to nucleophilic attack at the carbonyl group is:

What is the $\text{IUPAC}$ name of trans-2-chloro-3-iodo-2-pentene?

Which compound undergoes nucleophilic substitution reaction most easily?

Organic compound $A+{\text{NH}}_3\to B\stackrel{\Delta }{\to }C\stackrel{{\text{Br}}_2/\text{KOH}}{\to }\text{ethylamine}$. Compound $A$ is:

Which of the following compounds is most basic?

The state of hybridization of $C_2,C_3,C_5$ and $C_6$ of the hydrocarbon: is in the following sequence:

How many stereoisomers does the molecule ${\text{CH}}_3\text{CH}={\text{CHCH}}_2{\text{CHBrCH}}_3$ have?

The stability of carbanions in the following (alkynyl, alkenyl, alkyl) is in the order of:

The relative reactivities of acyl compounds towards nucleophilic substitution are in the order of:

Base strength of carbanions is in the order of:

The major product of the reaction between an alkene and $\text{HBr}$ in the presence of peroxides is governed by:

Which one the following is most reactive towards electrophilic attack?

In a ${\text{S}}_{N}2$ substitution reaction, which one of the following has the highest relative rate?

Acetophenone when reacted with a base, ${\text{C}}_2{\text{H}}_5\text{ONa}$, yields a stable compound which has the structure:

In the reaction of aniline with ${\text{NaNO}}_2/\text{HCl}$ at $0-5^{\circ }\text{C}$ followed by phenol, a coloured product C is obtained. The structure of C would be:

Match the compounds with their reactions/products:$(a)$ Benzaldehyde $(i)$ Phenolphthalein$(b)$ Phthalic anhydride $(ii)$ Benzoin condensation$(c)$ Phenyl benzoate $(iii)$ Oil of wintergreen$(d)$ Methyl salicylate $(iv)$ Fries rearrangement

Which of the following reactions is an example of nucleophilic substitution reaction?

Consider the following reaction:

The product Z is:

Benzene reacts with ${\text{CH}}_3\text{Cl}$ in the presence of anhydrous ${\text{AlCl}}_3$ to form:

Propionic acid with ${\text{Br}}_2/\text{P}$ yields a dibromo product. Its structure would be:

Predict the product

${\text{H}}_2\text{COH}\cdot {\text{CH}}_2\text{OH}$ (ethylene glycol) on heating with periodic acid gives:

The IUPAC name of the compound having the formula $\text{CH}\equiv \text{C}-\text{CH}={\text{CH}}_2$ is:

Which of the following compounds will exhibit cis-trans (geometrical) isomerism?

Consider the following reaction:

The product $Z$ is: