Organic Chemistry Questions

Statement I: In Lucas test, primary, secondary and tertiary alcohols are distinguished on the basis of their reactivity with conc. $\text{HCl}+{\text{ZnCl}}_2$, known as Lucas Reagent.Statement II: Primary alcohols are most reactive and immediately produce turbidity at room temperature on reaction with Lucas Reagent.

The correct IUPAC name of the following compound is:

Which of the following reactions is appropriate for converting acetamide to methanamine?

The IUPAC name of the compound is:

The alkene that exhibits geometrical isomerism is:

The incorrect statement regarding chirality is:

Which one of the following is not formed when acetone reacts with 2-pentanone in the presence of dilute $\text{NaOH}$ followed by heating?

The main product of the following reaction is
:

$29.5\text{mg}$ 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:

The two functional groups present in a typical carbohydrate are:

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

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 number of $\sigma$ bonds, $\pi$ bonds and lone pair of electrons in pyridine, respectively are:

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

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

The Kjeldahl's method for the estimation of nitrogen can be used to estimate the amount of nitrogen in which one of the following compounds?
(1)

Identify the major products $P,Q$ and $R$ in the following sequence of reactions:

The absolute configuration of the following molecule is:

$$\text{RMgX}+{\text{CO}}_2\stackrel{\text{dry ether}}{\to }Y\stackrel{{\text{H}}_3{\text{O}}^{+}}{\to }\text{RCOOH}$$
What is $Y$ in the above reaction?

The compound $A$ on treatment with $\text{Na}$ gives $B$, and with ${\text{PCl}}_5$ gives $C$. $B$ and $C$ react together to give diethyl ether. $A,B$ and $C$ are in the order:

Which of the following sequence of reactions is suitable to synthesize chlorobenzene?

Statement I: The boiling points of aldehydes and ketones are higher than hydrocarbons of comparable molecular masses because of weak molecular association in aldehydes and ketones due to dipole - dipole interactions.Statement II: The boiling points of aldehydes and ketones are lower than the alcohols of similar molecular masses due to the absence of H-bonding.

Statement I: The acidic strength of monosubstituted nitrophenol is higher than phenol because of electron withdrawing nitro group.Statement II: $o$ -nitrophenol, $m$ -nitrophenol and $p$ -nitrophenol will have same acidic strength as they have one nitro group attached to the phenolic ring.

$${\text{CH}}_3{\text{CH}}_2{\text{COO}}^{-}{\text{Na}}^{+}+\text{NaOH}\stackrel{\text{Heat},?}{\to }{\text{CH}}_3{\text{CH}}_3+{\text{Na}}_2{\text{CO}}_3$$
Identify the missing reagent:

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

Match List - I with List- II:| List-I (Products formed) | List-II (Reaction of carbonyl compound with) || :--- | :--- || (a) Cyanohydrin | (i) ${\text{NH}}_2\text{OH}$ || (b) Acetal | (ii) ${\text{RNH}}_2$ || (c) Schiff’s base | (iii) alcohol || (d) Oxime | (iv) $\text{HCN}$ |

Statement I: Primary aliphatic amines react with ${\text{HNO}}_2$ to give unstable diazonium salts.Statement II: Primary aromatic amines react with ${\text{HNO}}_2$ to form diazonium salts which are stable even above $300\text{K}$.

The reagent 'R' in the given sequence of chemical reaction is:

Identify the compound that will react with Hinsberg's reagent to give a solid which dissolves in alkali.

The intermediate compound "X" in the following chemical reaction is:

The major product formed in dehydrohalogenation reaction of 2-Bromopentane is pent-2-ene. This product formation is based on?

The correct sequence of bond enthalpy of '$\text{C-X}$ ' bond is:

Match List - I with List - II:

The major product of the following chemical reaction is:

Dihedral angle of least stable conformer of ethane is:

The compound which shows metamerism is:

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:

Amongst the following compounds, the optically active alkane having the lowest molecular mass 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 IUPAC name of the compound shown below is:

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

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

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

The correct structure of 2,6-Dimethyl-dec-4-ene is:

A tertiary butyl carbocation is more stable than a secondary butyl carbocation because of which of the following?

What is the IUPAC name of the organic compound formed in the following chemical reaction?
$$\text{Acetone}\underset{(ii){\text{H}}_2{\text{O, H}}^{+}}{\overset{(i){\text{C}}_2{\text{H}}_5\text{MgBr, dry Ether}}{\to }}\text{Product}$$

Buna-N synthetic rubber is a copolymer of:

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:

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:

The product formed in the following chemical reaction is:

Options:

The total number of pi-bond electrons in the structure of anthracene (${\text{C}}_{14}{\text{H}}_{10}$) is:

Consider the reaction sequences:$3\text{ROH}+{\text{PCl}}_3\to 3\text{RCl}+A$$\text{ROH}+{\text{PCl}}_5\to \text{RCl}+\text{HCl}+B$ What are A and B?

In the reaction ${\text{CH}}_3\text{C}\equiv \text{CH}\stackrel{\text{Red hot iron tube, }873\text{K}}{\to }A$. The number of ($\sigma$) bonds present in the product (A) is:

Major products A and B formed in the following reaction sequence are:

A reagent that can distinguish cis-cyclopenta-1,2-diol from the trans-isomer is:

Among the following, which hydrolysis reaction occurs at the slowest rate?

Fehling’s solution ‘A’ is:

A compound with a molecular formula of ${\text{C}}_6{\text{H}}_{14}$ has two tertiary carbons. Its IUPAC name is:

Which one of the following alcohols reacts instantaneously with Lucas reagent

Which amongst the following be most readily dehydrated under acidic conditions?

Consider the following reaction:The product Y is:

Options:

Consider the following reaction and identify the product (P):

Options:

Identify the final product [D] obtained in the following sequence of reactions:

With respect to the conformers of ethane, which of the following statements is true?

Which of the following reactions will not give primary amine as the product?

Which one is the most acidic compound?

The IUPAC name of the compound is:

Consider the reactions:

In Lassaigne’s extract of an organic compound, both nitrogen and sulphur are present, which gives blood red colour with ${\text{Fe}}^{3+}$ due to the formation of:

The correct increasing order of basic strength for the following compounds is:

Weight (g) of two moles of the organic compound, which is obtained by heating sodium ethanoate with sodium hydroxide in presence of calcium oxide is:

The most suitable method of separation of $1:1$ mixture of ortho and para-nitrophenols is:

Compound $X$ on reaction with ${\text{O}}_3$ followed by ${\text{Zn/H}}_2\text{O}$ gives formaldehyde and 2-methyl propanal as products. The compound $X$ is:

The heating of phenyl-methyl ethers with $\text{HI}$ produces:

Complete the following reaction:The product C is:

(a)

The vapor of secondary alcohol passed over heated copper at $573\text{K}$ yield:

The major products C and D formed in the following reaction respectively are:${\text{CH}}_3{\text{CH}}_2{\text{CH}}_2{\text{OC(CH}}_3{)}_3\stackrel{\text{Excess HI, }\Delta }{\to }\text{C}+\text{D}$

Which amine reacts with Hinsberg's reagent to produce an alkali insoluble product?

Which structure corresponds to the IUPAC name 3-Ethyl-2-hydroxy-4-methylhex-3-en-5-ynoic acid?

What is the correct order of the carboxylic acids' strength?

A few reactions are given below:

Select the reaction type for the above reactions:

Mark the reaction among the following that does not give benzoic acid as the major product:

The most stable carbocation among the following is:

The alkane that gives only one monochloro product on chlorination with ${\text{Cl}}_2$ in presence of diffused sunlight is:

Compound $A,{\text{C}}_8{\text{H}}_{10}\text{O}$, is found to react with $\text{NaOI}$ (produced by reacting $Y$ with $\text{NaOH}$) and yields a yellow precipitate with characteristic smell. $A$ and $Y$ are respectively:

Carboxylic acids have higher boiling points than aldehydes, ketones and even alcohols of comparable molecular mass. It is due to their:

Which of the following molecules represents the order of hybridisation $s{p}^2,s{p}^2,sp,sp$ from left to right atoms?

Which of the following carbocations is expected to be most stable?

Hydrocarbon ($A$) reacts with bromine by substitution to form an alkyl bromide which by Wurtz reaction is converted to gaseous hydrocarbon containing less than four carbon atoms. ($A$) is:

Which compound amongst the following is not an aromatic compound?
(1)

Nitration of aniline in strong acidic medium also gives m-nitroaniline because:

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

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:

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

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

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

The IUPAC name of neopentane 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:

In the Reimer-Tiemann reaction where Phenol reacts with ${\text{CHCl}}_3$ and $\text{NaOH}$, the electrophile involved is: