JEE Hydrocarbons PYQs with Video Solutions, Download PDF

3-Methyl-pent-2-ene on reaction with HBr in presence of peroxide forms an addition product. The number of possible stereoisomers for the product is

Which compound would give 5-keto-2-methyl hexanal upon ozonolysis?

One mole of a symmetrical alkene on ozonolysis gives two moles of an aldehyde having a molecular mass of $$44$$ u. The alkene is

An organic compound 'A' C$$_4$$H$$_8$$ on treatment with KMnO$$_4$$/H$$^+$$ yields compound 'B' C$$_3$$H$$_6$$O. Compound 'A' also yields compound 'B' on ozonolysis. Compound 'A' is:

A chloro compound "A".
(i) forms aldehydes on ozonolysis followed by the hydrolysis.
(ii) when vaporized completely 1.53 g of A, gives 448 mL of vapour at STP. The number of carbon atoms in a molecule of compound A is _________

The number of possible isomeric products formed when 3-chloro-1-butene reacts with HCl through carbocation formation is _______

on mercuration-demercuration produces the major product:

The number of acyclic structural isomers (including geometrical isomers) for pentene are ___.

The reaction of propene with HOCl ($$Cl_2 + H_2O$$) proceeds through the intermediate:

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): Treatment of bromine water with propene yields 1-bromopropan-2-ol.
Reason (R): Attack of water on bromonium ion follows Markovnikov rule and results in 1-bromopropan-2-ol.
In the light of the above statements, choose the most appropriate answer from the options given below:

The correct order of reactivity in electrophilic substitution reaction of the following compounds is:

Consider the following two reactions A and B.

Numerical value of [ molar mass of x + molar mass of y] is __

Polysubstitution is a major drawback in:

Among the following four aromatic compounds, which one will have the lowest melting point?

Consider the polycyclic aromatic compound, 1-phenylnaphthalene, whose structure is shown below. The various unique carbon positions on the aromatic rings are numbered from (1) to (4) as marked:

When this compound is subjected to mild electrophilic aromatic substitution (EAS) conditions,at which of the labeled positions will the electrophilic attack predominantly occur to form the major kinetic product? Write answer in integer [1 /2 /3 /4]

Which among the following is the strongest acid?

The major product obtained from the following reaction is:

Which one of the following reactions will not result in the formation of carbon-carbon bond?

Which one of the following compounds is non-aromatic?

Consider the following reactions. Total number of electrons in the $$\pi$$ bonds and lone pair of electrons in the product (X) is :

In a set of reactions p-nitrotoluene yielded a product E.

The product E would be:

Which compound is formed as the major product?

An alkane (Y) requires 8 moles of oxygen for complete combustion and on chlorination with Cl$$_2$$/h$$\nu$$, (Y) gives only one monochlorinated product (Z). The total number of primary carbon atoms in (Y) is __________.

Number of bromo derivatives obtained on treating ethane with excess of Br$$_2$$ in diffused sunlight is ______

Given below are two statements regarding the conformations of ethane.

Statement I: The rotation about the carbon-carbon single bond $$\mathrm{(C-C)}$$ in ethane is not completely free and is hindered by a small energy barrier.

Statement II: This energy barrier is primarily caused by strong steric hindrance between the hydrogen atoms of adjacent methyl groups.

Choose the most appropriate answer from the options given below.

According to IUPAC nomenclature rules, which of the following represents the correct decreasing order of priority for the given principal functional groups?

Consider the isomers of hydrocarbon with molecular formula C$$_5$$H$$_{10}$$. These isomers do not decolourise KMnO$$_4$$ solution. These isomers are subjected to chlorination with chlorine in presence of light to give monochloro compounds. The total number of monochloro compounds (structural isomers only) formed is __________.

Total number of isomeric compounds (including stereoisomers) formed by monochlorination of 2-methylbutane is ______.

Which of the following alkane isomers has the lowest boiling point?

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

$$P$$ g of the major product $$(X)$$ formed is reacted with $$\text{NaHCO}_3$$ solution to liberate a gas which occupied 11.2 dm³ at STP. $$P$$ = _____ g.
( Given molar mass in g $$mol^{-1} H:1,C:12,O:16,Cl:35.5$$)

During Kolbe’s electrolytic method, an aqueous solution of sodium propanoate $$\mathrm{(CH_3CH_2COONa)}$$ is electrolyzed. Which pair of gases is evolved as the major product at the anode?

The hydration of propyne results in formation of

The reagent needed for converting:

Which of the following reactions will yield $$2, 2-$$dibromopropane?

In the given reaction, the product 'A' is

Consider the following reactions:

'A' is:

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

But-2-yne and hydrogen (one mole each) are separately treated with (i) Pd/C and (ii) Na/ liq. NH3 to give the products X and Y respectively.

Identify the incorrect statements.
A. X and Y are stereoisomers.
B. Dipole moment of X is zero.
C. Boiling point of X is higher than Y.
D. X and Y react with $$O_{3}/Zn+H_{2}O$$ to give different products.
Choose the correct answer from the options given below :

The least acidic compound, among the following is:

1,2-dibromocyclooctane is treated with

'P' is :