Organic Chemistry Questions

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

p-cresol reacts with chloroform in alkaline medium to give compound A, which adds $\text{HCN}$ to form compound B. The latter on acidic hydrolysis gives a chiral carboxylic acid. The structure of this carboxylic acid is:

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

Among the following acids which has the lowest $\text{p}{K}_a$ value?

The reaction is fastest when $X$ is:

The decreasing order of nucleophilicity among the following nucleophiles is:

Amongst the following the most basic compound is:

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

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

Tertiary alkyl halides are practically inert to substitution by $S_{N}2$ mechanism because of:

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

An organic compound having molecular mass $60$ contains $C=20\%,H=6.67\%,N=46.67\%$, and rest Oxygen. On heating, it gives ${\text{NH}}_3$ along with a solid residue that gives a violet color with alkaline copper sulfate. The compound is:

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

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

Alkyl halides react with dialkyl copper reagents (Gilman reagents) to give:

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

The increasing order of stability of the following free radicals is:

The electrophile involved in this reaction is:

The reaction of toluene with ${\text{Cl}}_2$ in presence of ${\text{FeCl}}_3$ gives predominantly:

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

The term anomers of glucose refers to:

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

The IUPAC name of the compound shown below is:

Phenyl magnesium bromide reacts with methanol to give:

The pyrimidine bases present in $\text{DNA}$ are:

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

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

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

Fluorobenzene (${\text{C}}_6{\text{H}}_5\text{F}$) can be synthesized in the laboratory:

The correct order of increasing acid strength of the compounds:(a) ${\text{CH}}_3{\text{CO}}_2\text{H}$ (b) ${\text{MeOCH}}_2{\text{CO}}_2\text{H}$ (c) ${\text{CF}}_3{\text{CO}}_2\text{H}$ (d) ${\text{Me}}_2{\text{CHCO}}_2\text{H}$ (Isopropyl acetic acid)

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

The alkene formed as a major product in the elimination reaction of a quaternary ammonium hydroxide (Hofmann elimination) is:[Image showing N-ethyl-N,N-dimethylbutan-1-aminium hydroxide heated]

Which of the following molecules is expected to rotate the plane of plane polarized light?

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

Which of the following reactions will yield $2,2\text{-dibromopropane}$?

In the chemical reaction, ${\text{CH}}_3{\text{CH}}_2{\text{NH}}_2+{\text{CHCl}}_3+3\text{KOH}\to A+B+3{\text{H}}_2\text{O}$, the compound $(A)$ and $(B)$ are respectively:

Presence of a nitro group in a benzene ring:

Which one of the following conformations of cyclohexane is chiral?

In the following sequence of reactions, ${\text{CH}}_3{\text{CH}}_2\text{OH}\stackrel{{\text{P+I}}_2}{\to }A\stackrel{\text{Mg/ether}}{\to }B\stackrel{\text{HCHO}}{\to }C\stackrel{{\text{H}}_2\text{O}}{\to }D$, the compound 'D' is:

Reaction of trans-2-phenyl-1-bromocyclopentane with alcoholic $\text{KOH}$ produces:

Which one of the following is the strongest base in aqueous solution?

The compound formed as a result of oxidation of ethyl benzene by ${\text{KMnO}}_4$ is:

The IUPAC name of the compound is:

Phenol, when it first reacts with concentrated sulphuric acid and then with concentrated nitric acid, gives:

Which of the following undergoes a reaction with $50\%$ sodium hydroxide solution to give the corresponding alcohol and acid?

The absolute configuration of the following molecule is:

The hydrocarbon which can react with sodium in liquid ammonia is:

The treatment of ${\text{CH}}_3\text{MgX}$ with ${\text{CH}}_3\text{C}\equiv \text{C}-\text{H}$ produces:

Which of the following compounds is not chiral?

The correct decreasing order of priority for the functional groups of organic compounds in the IUPAC system of nomenclature is:

Arrange the carbanions, $({\text{CH}}_3{)}_3{\text{C}}^{-}$, ${\text{CCl}}_3^{-}$, $({\text{CH}}_3{)}_2{\text{CH}}^{-}$, ${\text{C}}_6{\text{H}}_5{\text{CH}}_2^{-}$, in order of their decreasing stability:

The alkene that exhibits geometrical isomerism is:

The major product obtained on interaction of phenol with sodium hydroxide and carbon dioxide is:

The number of stereoisomers possible for a compound of the molecular formula ${\text{CH}}_3-\text{CH}=\text{CH}-\text{CH}(\text{OH})\text{Me}$ is:

The compound formed in the positive test for nitrogen with the Lassaigne solution of an organic compound is:

The IUPAC name of neopentane is:

The two functional groups present in a typical carbohydrate are:

Toluene is nitrated and the resulting product is reduced with tin and hydrochloric acid. The product so obtained is diazotized and then heated with cuprous bromide. The reaction mixture so formed contains:

Which one of the following is reduced with zinc and hydrochloric acid to give the corresponding hydrocarbon?

In the following sequence of reactions, the alkene affords the compound ‘B’:
$${\text{CH}}_3\text{CH}={\text{CHCH}}_3\stackrel{{\text{O}}_3}{\to }\text{A}\stackrel{{\text{H}}_2\text{O/Zn}}{\to }\text{B}$$
The compound B is:

The electrophile, ${\text{E}}^{+}$, attacks the benzene ring to generate the intermediate $\sigma$ -complex. Of the following, which $\sigma$ -complex is of lowest energy?

Among the following compounds, which can be dehydrated very easily?

Buna-N synthetic rubber is a copolymer of:

In the chemical reactions, the compounds 'A' and 'B' respectively are:

$29.5\text{mg}$ of an organic compound containing nitrogen was digested according to Kjeldahl’s method and the evolved ammonia was absorbed in $20\text{mL}$ of $0.1\text{M HCl}$ solution. The excess of the acid required $15\text{mL}$ of $0.1\text{M NaOH}$ solution for complete neutralization. The percentage of nitrogen in the compound is:

A liquid was mixed with ethanol and a drop of concentrated ${\text{H}}_2{\text{SO}}_4$ was added. A compound with a fruity smell was formed. The liquid was:

For which of the following parameters would the structural isomers ${\text{C}}_2{\text{H}}_5\text{OH}$ and ${\text{CH}}_3{\text{OCH}}_3$ be expected to have the same values? (Assume ideal behavior)

The main product of the following reaction is
:

Which of the following on heating with aqueous $\text{KOH}$, produces acetaldehyde?

Which one of the following has the minimum boiling point?

Out of the following, the alkene that exhibits optical isomerism is:

Trichloroacetaldehyde was subjected to Cannizzaro's reaction by using $\text{NaOH}$. The mixture of the products contains sodium trichloroacetate and another compound. The other compound is:

In the Cannizzaro reaction: $2\text{PhCHO}\stackrel{:{\text{OH}}^{-}}{\to }{\text{PhCH}}_2\text{OH}+{\text{PhCOO}}^{-}$, the slowest step is:

The strongest acid amongst the following compounds is:

The ammonia evolved from the treatment of $0.30\text{g}$ of an organic compound for the estimation of nitrogen was passed in $100\text{mL}$ of $0.1\text{M}$ sulphuric acid. The excess of acid required $20\text{mL}$ of $0.5\text{M}$ sodium hydroxide solution for complete neutralization. The organic compound is:

Ozonolysis of an organic compound gives formaldehyde as one of the products. This confirms the presence of:

Silver Mirror test is given by which one of the following compounds?

Consider the following bromides:

The correct order of ${\text{S}}_{\text{N}}1$ reactivity is:

Which of the following reagents may be used to distinguish between phenol and benzoic acid?

Phenol is heated with a solution of mixture of $\text{KBr}$ and ${\text{KBrO}}_3$. The major product obtained in the above reaction is:

Which one of the following does not have $s{p}^2$ hybridized carbon?

Identify the compound that exhibits tautomerism.

Ortho-Nitrophenol is less soluble in water than p- and m- Nitrophenols because:

Sodium ethoxide has reacted with ethanoyl chloride. The compound that is produced in the above reaction is:

The IUPAC name of the compound shown below is:

Which branched chain isomer of the hydrocarbon with molecular mass $72\text{u}$ gives only one isomer of mono substituted alkyl halide?

2-Hexyne gives trans-2-hexene on treatment with:

Iodoform can be prepared from all except:

The rate of the reaction is fastest when $Z$ is:

In the transformation of 4-hydroxy-2-butanone to 4-hydroxybutane (reduction of carbonyl to methylene), which of the following is the most appropriate reagent?

How many chiral compounds are possible on monochlorination of 2-methylbutane?

Amongst the following compounds, the optically active alkane having the lowest molecular mass is:

Consider the acidity of the following carboxylic acids:
(1) $\text{PhCOOH}$
(2) $\text{o}–{\text{NO}}_2{\text{C}}_6{\text{H}}_4\text{COOH}$
(3) $\text{p}–{\text{NO}}_2{\text{C}}_6{\text{H}}_4\text{COOH}$
(4) $\text{m}–{\text{NO}}_2{\text{C}}_6{\text{H}}_4\text{COOH}$
Which one is the most acidic?

Which of the following will have a meso-isomer also?

Which of the following is the strongest base?

The compound formed on heating chlorobenzene with chloral in the presence of concentrated sulphuric acid is:

On mixing ethyl acetate with aqueous sodium chloride, the composition of the resultant solution is:

Acetyl bromide reacts with an excess of ${\text{CH}}_3\text{MgI}$ followed by treatment with a saturated solution of ${\text{NH}}_4\text{Cl}$ to give:

The organic chloro compound which shows complete stereochemical inversion during a ${\text{S}}_{N}2$ reaction is: