Hydrocarbons PYQs - Last 5 Years

\(\text { The decreasing order of reactivity towards electrophilic substitutions is: }\)

When 2-butyne is treated with dilute $\mathrm{H}_2 \mathrm{SO}_4 / \mathrm{HgSO}_4$, the product formed is:

A compound with molecular formula $\mathrm{C}_5 \mathrm{H}_{10}$ that gives acetone on ozonolysis is:

$$ \begin{aligned} &\text { What is the major product }\left[\mathrm{P}_3\right] \text { formed when } n \text { - Hexane undergoes the given series of reactions: }\\ &\begin{aligned} \text { n-Hexane } & \frac{\mathrm{V}_2 \mathrm{O}_5}{20...

An unsaturated organic compound $\left(\mathrm{C}_3 \mathrm{H}_6\right)$, undergoes the following series of reactions:
Identify compound [D]

The statements given below contains assertion and reason. Choose the correct option
Assertion (A): Propene reacts with HBr in presence of organic peroxide gives 1-bromopropane.
Reason(R): The reaction occurs through carbocation intermediate...

Arrange the given alkanes in increasing order of their boiling points.
(A) 2, 2-dimethylpropane
(B) 2-methylbutane
(C) n-pentane
(D) n-butane

An unsaturated hydrocarbon $[\mathrm{A}]$ undergoes the following series of reactions. Identify $[\mathrm{A}]$.

Which one of the following statements is correct?.

Identify the type of reaction:

What would be the major product formed in the reaction?

Identify the Alkane (molecular formula $\mathrm{C}_8 \mathrm{H}_{18}$ ) which yields only a single monochloride on Chlorination in the presence of sunlight.

Consider the following reaction
\(\text { Propyne }+\mathrm{CH}_3 \mathrm{MgBr} \xrightarrow{\text { dry ether }} \mathbf{X}\)
Identify ' X ' from the following.

Which of the following alkene on reductive ozonolysis gives ketones only as the product

Identify the Carbonyl compound which will not be formed when hydration of Alkynes is carried out with dil. $\mathrm{H}_2 \mathrm{SO}_4 / \mathrm{Hg}^{2+}$ at 333 K .
Acetone, Butanal, Ethanal, Butanone.

The number of grams of bromine that will completely react with 5 g of pentene is :
[Atomic mass of $\mathrm{Br}=80 \mathrm{u}$ ]

Match the reactions in Column I with the correct products given in Column II

.tg {border-collapse:collapse;border-spacing:0;}
.tg td{border-color:black;border-style:solid;border-width:1px;font-family:Arial, sans-serif;font-size:14px;
ov...

When one mole of a hydrocarbon $\mathbf{C}_{\mathbf{a}} \mathbf{H}_{\mathbf{b}}$ undergoes complete combustion, it requires 7.5 moles of $\mathrm{O}_2$ and results in the production of 6 moles of $\mathrm{CO}_2$. Calculate the values of $\m...

An Alkene " X " on reaction with hot acidified $\mathrm{KMnO}_4$ gave a mixture of Ethanoic acid and Propanone. Identify " X ".

An aromatic hydrocarbon \([\mathrm{A}]\left(\mathrm{Molecular}\right.\) formula \(\left.\mathrm{C}_9 \mathrm{H}_{12}\right)\), undergoes air oxidation followed by reaction with dil.
\(\mathrm{HCl}\) to give [B] as one of the products
Compou...

An unsaturated hydrocarbon \([\mathrm{A}]\) reacts with \(\mathrm{HBr}\) in presence of Benzoyl peroxide to yield [B]
Compound [A] when reacted with cold, dilute alkaline \(\mathrm{KMnO}_4\) gave compound [C], 2-Methylbutane-2, 3-diol But w...

Identify the product \([\mathrm{C}]\) formed at the end of the reaction below
1,1,2,2- Tetrabromopropane + 2 \(\mathrm{Zn}_{(\mathrm{S})}\) / Ethanol \(\rightarrow\) [B]
\([\mathrm{B}]\) + 2 moles of \(\mathrm{HBr} \rightarrow[\mathrm{C}]\)

Given below are 4 reactions. Two of these reactions will give product which is an equimolar mixture of the d and 1 forms. Identify these 2 reactions.
[A] 2- Methylpropene + \(\mathrm{HI} \rightarrow\) ---------
[B] But-1-ene + $$\mathrm{HB...

A Hydrocarbon [A] (molecular formula \(\mathrm{C}_3 \mathrm{H}_6\)) on reaction with \(\mathrm{Br}_2 / \mathrm{CCl}_4\) gave [B]. When [B] is heated with 2 moles of alcoholic \(\mathrm{KOH}\), it gave compound [C]. 3 moles of Compound [C] w...

Which of the following reactions is an example for incomplete combustion?

Identify the reagents \(\mathrm{X}, \mathrm{Y}\) and \(\mathrm{Z}\) used to bring out the following reactions.

The conversion of Propyne to Benzene can be brought out in 4 steps.
Choose the reagents to be used, in the proper sequential order, to bring out the conversion.
Reagents provided: alc. $$\mathrm{KOH}, \mathrm{H}_2 / \mathrm{Pd}, \mathrm{Na}...

Ammoniacal silver nitrate forms a white precipitate easily with

Which of the product is not possible in Wurtz reaction?

What can be A and B in the following reaction?