Organic Chemistry Questions

Which one of the following reactions does NOT give benzene as the product?

The correct order of decreasing basic strength of the given amines is:

Total number of possible isomers (both structural as well as stereoisomers) of cyclic ethers of molecular formula ${\text{C}}_4{\text{H}}_8\text{O}$ is :

Predict the major product 'P' in the following sequence of reactions:

Which one of the following compounds can exist as cis-trans isomers?

Predict the major product of the following reaction:

Which one of the following alkenes will react faster with H2 under catalytic hydrogenation conditions ?
(R = Alkyl substituent)

Which one of the following compounds is most acidic ?

Which one of the following pairs represents stereoisomerism ?

In a set of reactions $m$ -bromobenzoic acid gave a product $D$. Identify the product $D$.

Which one of the following is most reactive towards electrophilic reagent?

In Dumas' method of estimation of nitrogen $0.35\text{g}$ of an organic compound gave $55\text{mL}$ of nitrogen collected at $300\text{K}$ temperature and $715\text{mm}$ pressure. The percentage composition of nitrogen in the compound would be: (Aqueous tension at $300\text{K}=15\text{mm}$)

What is the product obtained in the following reaction: $\text{Nitrobenzene}\stackrel{{\text{Zn/NH}}_4\text{Cl}}{\to }\dots$?

Clemmensen reduction of a ketone is carried out in the presence of which of the following?

In the following reactions, the major products $A$ and $C$ are respectively:$\text{2-methylbutan-2-ol}\stackrel{{\text{H}}^{+}/\Delta }{\to }A\text{ (Major)}\stackrel{\text{HBr/Dark}}{\to }C\text{ (Major)}$

Which one is a nucleophilic substitution reaction among the following?

The correct IUPAC name of the compound

Considering the state of hybridization of carbon atoms, find out the molecule among the following which is linear?

The Lassaigne's extract is boiled with conc. ${\text{HNO}}_3$ while testing for halogens. By doing so it:

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

Self condensation of two moles of ethyl acetate in presence of sodium ethoxide yields :

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

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

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

The correct order regarding the electronegativity of hybrid orbitals of carbon is:

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:

Predict the product

The major organic product in the reaction,${\text{CH}}_3-\text{O}-\text{CH}({\text{CH}}_3{)}_2+\text{HI}\to \text{Product}$ is :

Consider the following reaction:

The product $Z$ 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:

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:

Ethylene oxide when treated with Grignard reagent yields :

Which one is most reactive towards electrophilic reagent?

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

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

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

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

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

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

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

Which compound undergoes nucleophilic substitution reaction most easily?

Which of the following compounds is most basic?

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

What is the order of reactivity of $\text{PhMgBr}$ with the following:

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 mechanisms of reactions $(i)$ and $(ii)$ are:$(i)$ Isobutyl bromide $+{\text{C}}_2{\text{H}}_5\text{OH}\to$ Ether$(ii)$ Isobutyl bromide $+{\text{C}}_2{\text{H}}_5{\text{O}}^{-}\to$ Ether

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

Correct configuration of the following is:

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:

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

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:

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

The major organic product formed from the following reaction :

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.

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:

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

A carbonyl compound reacts with hydrogen cyanide to form cyanohydrin which on hydrolysis forms a racemic mixture of $\alpha$ -hydroxy acid. The carbonyl compound is :

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

The major product formed in the following reaction is:

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

Nucleophilic addition reaction will be most favoured in :

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:

Products of the following reaction :

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

Which of the following is not chiral?

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

Among the following the most stable compound is:

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

Which of the following is more basic than aniline?

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

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

Base strength of carbanions is in the order of:

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.

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

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

The IUPAC name of is :

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

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

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

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

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

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

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

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

Pyridine is less basic than triethylamine because:

Which one the following is most reactive towards electrophilic attack?

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

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:

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

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:

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

In a set of reactions propanoic acid yielded a compound D.${\text{CH}}_3{\text{CH}}_2\text{COOH}\stackrel{{\text{SOCl}}_2}{\to }\text{B}\stackrel{{\text{NH}}_3}{\to }\text{C}\underset{\text{KOH}}{\overset{{\text{Br}}_2}{\to }}\text{D}$ The structure of D would be :

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

Consider the following reaction:

The product Z is:

Which amongst the following is the most stable carbocation ?

Which of the following gives propyne on hydrolysis?