Organic Chemistry Questions

Which one is the correct order of acidity?

Identify product (A) in the following reaction:

Identify the product in the following reaction:

Of the following, which is the product formed when cyclohexanone undergoes aldol condensation followed by heating?

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

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.

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

Predict the correct intermediate and product in the following reaction:
$${\text{CH}}_3-\text{C}\equiv \text{CH}\stackrel{{\text{H}}_2{\text{O, H}}_2{\text{SO}}_4,{\text{HgSO}}_4}{\to }\text{Intermediate (A)}\to \text{Product (B)}$$

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

The incorrect statement regarding chirality is:

The correct statement regarding electrophile is:

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

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

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.

$29.5\text{mg}$ 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:

Consider the following bromides:

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

The alkene that exhibits geometrical isomerism is:

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

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

A compound with a molecular formula of ${\text{C}}_6{\text{H}}_{14}$ has two tertiary carbons. Its IUPAC name 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 absolute configuration of the following molecule 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?

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

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

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 $300\text{K}$.

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:

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 correct IUPAC name of the following compound 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)

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

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

The product formed from the following reaction sequence is:

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

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

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

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

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

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

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

The compound which shows metamerism is:

The product formed in the following chemical reaction is:

Options:

Match List - I with List - II:

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

The major product of the following chemical reaction is:

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

Dihedral angle of least stable conformer of ethane is:

Fehling’s solution ‘A’ is:

The main product of the following reaction is
:

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

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

Which of the following compounds will undergo $S_{N}1$ reaction with the fastest rate?

Identify the major product C formed in the following reaction sequence:${\text{CH}}_3{\text{CH}}_2{\text{CH}}_2\text{I}\stackrel{\text{NaCN}}{\to }A\stackrel{\text{Partial Hydrolysis}}{\to }B\stackrel{{\text{NaOH, Br}}_2}{\to }C$

Given below are two statements:Statement I: Aniline does not undergo Friedel-Crafts alkylation.Statement II: Aniline cannot be prepared through Gabriel phthalimide synthesis.

Given below are two statements:Statement I: The boiling point of three isomeric pentanes follows the order: $n$ -pentane $>$ isopentane $>$ neopentane.Statement II: When branching increases, the molecule attains a spherical shape, reducing surface area and intermolecular forces, thereby lowering the boiling point.

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

The given compound

is an example of:

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

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

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

Complete the following reaction:The product C is:

(a)

Identify the major product obtained in the following reaction:

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?

Identify A and predict the type of reaction:

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) $\text{HCN}$ |

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:

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

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

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

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

Buna-N synthetic rubber is a copolymer of:

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:

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:

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

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

Which one is the most acidic compound?

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

The IUPAC name of the compound is:

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

The most stable carbocation among the following is:

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

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

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

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

A few reactions are given below:

Select the reaction type for the above reactions:

The IUPAC name of the compound is:

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

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

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

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.

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

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

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

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

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:

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

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:

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

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: