General Organic Chemistry — JEE Advanced PYQs

Considering ${\mathrm{LiBH}}_4$ reduces an ester group to the corresponding alcohol and does not reduce a carboxylic acid group, the correct statement about the major products P, Q R and S is

The number of isomeric tetraenes (NOT containing $sp$-hybridized carbon atoms) that can be formed from the following reaction sequence is ____.

Among the following, the conformation that corresponds to the most stable conformation of meso-butane-2,3-diol is -

Newman projections P, Q, R and S are shown below:

Which one of the following options represents identical molecules?

Which one of the following structures has the IUPAC name 3-ethynyl-2-hydroxy-4-methylhex-3-en-5-ynoic acid?

With respect to the compounds I-V, choose the correct statement(s).

In the following reaction, compound Q is obtained from compound P via an ionic intermediate

What is the degree of unsaturation of Q?

For the given compound X, the total number of optically active stereoisomers is ____.

(In the structure of X: a bold wedge bond indicates that the configuration at the specific carbon and the geometry of the double bond is fixed; a wavy bond indicates that the co …

The order of basicity among the following compounds is

(see structure) I

(see structure) II

(see structure) III

(see structure) IV

The IUPAC name(s) of the following compound is(are)

The correct order of acidity for the following compounds is

The total number of stereoisomers that can exist for M is

The number of resonance structures for N is

Compound(s) that on hydrogenation produce(s) optically inactive compound(s) is(are)

The correct combination of names for isomeric alcohols with molecular formula ${\mathrm{C}}_4{\mathrm{H}}_{10}\mathrm{O}$ is/are

The total number(s) of stable conformers with non-zero dipole moment for the following compound is (are)

Different possible thermal decomposition pathways for peroxyesters are shown below. Match each pathway from List I with an appropriate structure from List II and select the correct answer using the code given below the lists.

List-I

P. Pathway P

Q. Pathway Q

R. Pathway R

S. …

Among $\mathbf{P},\mathbf{Q},\mathbf{R}$ and $\mathbf{S}$, the aromatic compound(s) is/are

The hyperconjugative stabilities of tert-butyl cation and 2-butene, respectively, are due to

$P$ and $Q$ are isomers of dicarboxylic acid ${\mathrm{C}}_4{\mathrm{H}}_4{\mathrm{O}}_4$. Both decolorize ${\mathrm{Br}}_2/{\mathrm{H}}_2\mathrm{O}$. On heating, $\mathbf{P}$ forms the cyclic anhydride. Upon treatment with dilute alkaline ${\mathrm{KMnO}}_4$, …

$P$ and $Q$ are isomers of dicarboxylic acid ${\mathrm{C}}_4{\mathrm{H}}_4{\mathrm{O}}_4$. Both decolorize ${\mathrm{Br}}_2/{\mathrm{H}}_2\mathrm{O}$. On heating, $\mathbf{P}$ forms the cyclic anhydride. Upon treatment with dilute alkaline ${\mathrm{KMnO}}_4$, …

Which of the given statement(s) about $\mathbf{N},\mathbf{O},\mathbf{P}$ and $\mathbf{Q}$ with respect to $\mathbf{M}$ is (are) correct?

(A) $\mathbf{M}$ and $\mathbf{N}$ are non-mirror image stereoisomers
(B) $\mathbf{M}$ and $\mathbf{O}$ are identical
(C) M and …

The total number of contributing structures showing hyperconjugation (involving C-H bonds) for the following carbocation is

Match the reactions in column I with appropriate types of steps/reactive intermediate involved in these reactions as given in column II
| (B) (see structure) | (q) Electrophilic substi …

Among the following compounds, the most acidic is

In the Newman projection for 2,2-dimethylbutane

$\mathbf{X}$ and $\mathbf{Y}$ can respectively be

The total number of cyclic isomers possible for a hydrocarbon with the molecular formula ${\mathrm{C}}_4{\mathrm{H}}_6$ is

Amongst the following, the total number of compounds soluble in aqueous NaOH is

(see structure)

Match the reactions in Column I with appropriate options in Column II.
| D) (see structure) | s) Cou …

The IUPAC name of the following compound is

(see structure)

The correct statement(s) about the compound ${\mathrm{H}}_3\mathrm{C}(\mathrm{HO})\mathrm{HC}-\mathrm{CH}=\mathrm{CH}-\mathrm{CH}(\mathrm{OH}){\mathrm{CH}}_3$ ($\mathbf{X}$) is(are)

In the following carbocation, $\mathrm{H}/{\mathrm{CH}}_3$ that is most likely to migrate to the positively charged carbon is

The correct stability order of the following resonance structures is

${\mathrm{H}}_2\mathrm{C}=\stackrel{+}{\mathrm{N}}=\stackrel{-}{\mathrm{N}}$ (I)

${\mathrm{H}}_2\stackrel{+}{\mathrm{C}}-\mathrm{N}=\stackrel{-}{\mathrm{N}}$ (II) …

Match each of the compounds given in Column I with the reaction(s), that they can undergo, given in Column II.

Column I

(A) (see structure)

(B) (see structure)

(C) (see structure)

(D) (see structure)

Column II

(p) Nucleophilic substitution

(q) Elimination

(r) Nucleophili …

The total number of cyclic structural as well as stereo isomers possible for a compound with the molecular formula ${\mathrm{C}}_5{\mathrm{H}}_{10}$ is

Hyperconjugation involves overlap of the following orbitals

The correct statement(s) about the compound given below is (are)

The correct statement(s) concerning the structures $\mathbf{E}$, $\mathbf{F}$ and $\mathbf{G}$ is (are)

The correct stability order for the following species is
(I) (see structure)
(II) (see structure)
(III) (see structure)
(IV) (see structure)

Among the following, the least stable resonance structure is

STATEMENT-1 : Molecules that are not superimposable on their mirror images are chiral.
because
STATEMENT-2 : All chiral molecules have chiral centres.

Match the compounds/ions in Column I with their properties/reactions in Column II. Indicate your answer by darkening the appropriate bubbles of the $4\times 4$ matrix given in the ORS.
| (A) …

The IUPAC name of ${\mathrm{C}}_6{\mathrm{H}}_5\mathrm{COCl}$ is