Hydrocarbons — JEE Main PYQs

Identify A in the following reaction.

Given below are two statements :

Statement I : Benzene is nitrated to give nitrobenzene, which on further treatment with
${\mathrm{CH}}_3\mathrm{COCl}/{\mathrm{AlCl}}_3$ will give

As compared with chlorocyclohexane, which of the following statements correctly apply to chlorobenzene?
A. The magnitude of negative charge is more on chlorine atoms
B. The $\mathrm{C}-\mathrm{Cl}$ bond has partial double bond character
C. $\mathrm{C}-\mathrm{Cl}$ bond is les …

The cycloalkane ( X ) on bromination consumes one mole of bromine per mole of ( X ) and gives the product ( Y ) in which $\mathrm{C}:\mathrm{Br}$ ratio is $3:1$. The percentage of bromine in the product $(\mathrm{Y})$ is
____ %. (Nearest integer)
(Given : Molar mass …

The dibromo compound [P] (molecular formula: ${\mathrm{C}}_9{\mathrm{H}}_{10}{\mathrm{Br}}_2$) when heated with excess sodamide followed by treatment with dilute HCl gives [Q]. On warming [Q] with mercuric sulphate and dilute sulphuric acid yield [R] which gives positive Iodoform t …

But-2-yne and hydrogen (one mole each) are separately treated with (i) $\mathrm{Pd}/\mathrm{C}$ and (ii) $\mathrm{Na}/$ liq. ${\mathrm{NH}}_3$ to give the products X and Y respectively.

Identify the incorrect statements.
A. $X$ and $Y$ are stereoisomers.
B. Dipole moment of X …

Consider the following compounds

Arrange these compounds in the increasing order of reactivity with nitrating mixture.

Arrange the following alkenes in decreasing order of stability.
I. (see structure)
II. (see structure)
III. (see structure)
IV. (see structure)

Choose the correct answer from the options given below :

Method used for separation of mixture of products ( B and C ) obtained in the following reaction is:

$\mathrm{Ph}-\mathrm{CH}=\mathrm{CH}{}_2\underset{\mathrm{HBr}}{\overset{(\mathrm{PhCOO}{)}_2}{\to }}$ Product

Consider the above reaction
A. The reaction proceeds through a more stable radical intermediate.
B. The role of peroxide is to generate $\dot{H}$ (Hydrogen radical).
C. During this reaction, benzene is formed as a b …

Identify the correct statements :

The presence of $-{\mathrm{NO}}_2$ group in benzene ring
A. activates the ring towards electrophilic substitutions.
B. deactivates the ring towards electrophilic substitutions.
C. activates the ring towards nucleophilic substitutions.
D. deact …

The reactions which produce alcohol as the product area :
A. ${\mathrm{CH}}_4+{\mathrm{O}}_2\underset{\Delta }{\overset{{\mathrm{Mo}}_2{\mathrm{O}}_3}{\to }}$
B. …

Which of the following reaction is NOT correctly represented?

For the given molecule, "x", the preferred site for the attack of the electrophile is:

Consider the isomers of hydrocarbon with molecular formula ${\mathrm{C}}_5{\mathrm{H}}_{10}$. These isomers do not decolourise ${\mathrm{KMnO}}_4$ solution. These isomers are subjected to chlorination with chlorine in presence of light to give monochloro compounds. The total numbe …

An alkene (X) on ozonolysis followed by reduction gives following products.

2 moles of formaldehyde, glyoxal, and methylglyoxal.

The alkene ( X ) is :

Consider the following sequence of reactions to give the major product (X)

(reaction scheme shown)

P g of the major product ( X ) formed is reacted with ${\mathrm{NaHCO}}_3$ soluion to liberate a gas which occupied $11.2{\mathrm{dm}}^3$ at STP.
$\mathrm{P}=$ ______ . g.
(Given …

The compound (X) on
(i) on heating in the presence of anhydrous ${\mathrm{AlCl}}_3$ and HCl gas gives 2, 4-dimethyl pentane
(ii) aromatization gives toluene and
(iii) cyclisation gives methyl cyclohexane

The correct name of compound $(\mathrm{X})$ is :

Compound (X) is subjected to the sequence of reactions as shown above. Molar mass of the major product (Y) formed is _____ ${\mathrm{gmol}}^{-1}$.
(Given molar mass in ${\mathrm{g}\mathrm{mol}}^{-1}$ C: 12, H: 1, O: 16)

"P" is hydrocarbon of molecular formula : ${\mathrm{C}}_8{\mathrm{H}}_{14}$. On ozonolysis, "P" forms "Q". "Q" on treatment with alkali under reflux condition produces. "R", which on treatment with ${\mathrm{I}}_2/\mathrm{NaOH}$ gives a yellow precipitate. Acidification of the s …

For the following Friedel Craft's alkylation reaction, which of the statements are correct?

(see reaction)

A. Major product is n -propyl benzene.
B. iso-propyl carbocation intermediate is also generated
C. Multiple substitution is inevitable.
D. Introducing electron-donating su …

Given below are two statements :

Statement-I : Methane can be prepared by decarboxylation of sodium ethanoate, Kolbe's electrolysis of sodium acetate and reaction of ${\mathrm{CH}}_3\mathrm{MgBr}$ with water.

Statement-II : Methane cannot be prepared from unsaturated hydrocarbons …

An alkane (Y) requires 8 moles of oxygen for complete combustion and on chlorination with Cl₂/hν, (Y) gives only one monochlorinated product (Z). The total number of primary carbon atoms in (Y) is _____.

The major product of which of the following reaction is not obtained by rearrangement reaction?

Given below are two statements :

Statement I: One mole of propyne reacts with excess of sodium to liberate half a mole of ${\mathrm{H}}_2$ gas.

Statement II : Four g of propyne reacts with ${\mathrm{NaNH}}_2$ to liberate ${\mathrm{NH}}_3$ gas which occupies 224 mL at STP.

In t …

When sec-butylcyclohexane reacts with bromine in the presence of sunlight, the major product is :

Residue (A) +HCl (dil.) → Compound (B)

Structure of residue (A) and compound (B) formed respectively is :

The alkane from below having two secondary hydrogens is :

The compound with molecular formula ${\mathrm{C}}_6{\mathrm{H}}_6$, which gives only one monobromo derivative and takes up four moles of hydrogen per mole for complete hydrogenation has ____ $\pi$ electrons.

Following are the four molecules "P", "Q", "R" and "S".
Which one among the four molecules will react with $\mathrm{H}-\mathrm{Br}(\mathrm{aq})$ at the fastest rate ?

The product (A) formed in the following reaction sequence is :

Identify correct statement/s :
(A) $-{\mathrm{OCH}}_3$ and $-{\mathrm{NHCOCH}}_3$ are activating group
(B) -CN and -OH are meta directing group
(C) -CN and $-{\mathrm{SO}}_3\mathrm{H}$ are meta directing group
(D) Activating groups act as ortho - and para directing groups …

Propane molecule on chlorination under photochemical condition gives two di-chloro products, " x " and " y ". Amongst " x " and " y ", " x " is an optically active molecule. How many tri-chloro products (consider only structural isomers) will be obtained from "x" when it is furth …

Match List - I with List - II.

List - I: Isomers of ${\mathrm{C}}_{10}{\mathrm{H}}_{14}$
List - II: Ozonolysis product

Choose the correct answer from the options given below:

A compound ' X ' absorbs 2 moles of hydrogen and ' X ' upon oxidation with ${\mathrm{KMnO}}_4\mid {\mathrm{H}}^{+}$gives

The total number of $\sigma$ bonds present in the compound ' X ' is ____ .

Identify product $[\mathrm{A}],[\mathrm{B}]$ and $[\mathrm{C}]$ in the following reaction sequence :

The product B formed in the following reaction sequence is :

The total number of compounds from below when treated with hot ${\mathrm{KMnO}}_4$ giving benzoic acid is :

Given below are two statements :

Statement (I) : On nitration of m -xylene with ${\mathrm{HNO}}_3,{\mathrm{H}}_2{\mathrm{SO}}_4$ followed by oxidation, 4-nitrobenzene-1, 3-dicarboxylic acid is obtained as the major product.
Statement (II) : ${\mathrm{CH}}_3$ group is …

Total number of sigma ($\sigma$) ______ and pi($\pi$) ______ bonds respectively present in hex-1-en-4-yne are :

Isomeric hydrocarbons → negative Baeyer's test (Molecular formula ${\mathrm{C}}_9{\mathrm{H}}_{12}$ )
The total number of isomers from above with four different non-aliphatic substitution sites is -

An optically active alkyl halide $\mathrm{C}{}_4\mathrm{H}{}_9\mathrm{Br}$ [A] reacts with hot KOH dissolved in ethanol and forms alkene [B] as major product which reacts with bromine to give dibromide [C]. The compound [C] is converted into a gas [D] upon reacting with alcoholic $\mathrm{NaNH}{}_2$. During hydrat …

Given below are two statements :

Statement (I) : Neopentane forms only one monosubstituted derivative.

Statement (II) : Melting point of neopentane is higher than n-pentane

In the light of the above statements, choose the most appropriate answer from the options given below :

In 3, 3-dimethylhex-1-ene-4-yne, there are $\_\_\_\_$ ${\mathrm{sp}}^3$, $\_\_\_\_$ ${\mathrm{sp}}^2$ and $\_\_\_\_$ sp hybridised carbon atoms respectively :

Which compound would give 3-methyl-6-oxoheptanal upon ozonolysis ?

Benzene is treated with oleum to produce compound ( X ) which when further heated with molten sodium hydroxide followed by acidification produces compound (Y).The compound Y is treated with zinc metal to produce compound (Z). Identify the structure of compound (Z) from the follow …

The number of optically active products obtained from the complete ozonolysis of the given compound is :

Given below are two statements :

Statement I: Ozonolysis followed by treatment with $\mathrm{Zn},{\mathrm{H}}_2\mathrm{O}$ of cis-2-butene gives ethanal.

Statement II : The production obtained by ozonolysis followed by treatment with …

Choose the correct set of reagents for the following conversion.

1, 2-dibromocyclooctane …