Hydrocarbons - Organic Chemistry - Chemistry Previous Year Questions

The general formula of a cycloalkene is

According to Baeyer's strain theory which is highly stable?

What is the product formed when benzene react with CO and HCl in presence of anhydrous AlCl\(_3\)?

Coupling reaction is an example of

The hydrocarbon that cannot be prepared effectively by Wurtz reaction

Which of the product is not possible in Wurtz reaction?

What can be A and B in the following reaction?

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. \(\mathrm{KOH}, \mathrm{H}_2 / \mathrm{Pd}, \mathrm{Na} /\) dry ether, \(\mathrm{HBr}, \mathrm{HBr} /\left(\mathrm{C}_6 \mathrm{H}_5 \mathrm{CO}\right)_2 \mathrm{O}_2\), Soda-lime, \(\mathrm{Cr}_2 \mathrm{O}_3\) (high T and P), Conc. \(\mathrm{H}_2 \mathrm{SO}_4\)

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

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

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 + \(\mathrm{HBr} \rightarrow\) -----------

[C] 3-Methylbut-1-ene + \(\mathrm{HI} \rightarrow\) -----------

[D] 3- Phenylpropene + \(\mathrm{HBr}\) (Peroxide) \(\rightarrow\) -----------

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] when passed through red hot Iron tube forms [D]. Identify [D].

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

Compound [B] forms a white precipitate on treatment with \(\mathrm{Br}_2(\mathrm{aq})\)

Sodium salt of [B] reacts with \(\mathrm{CO}_2\) at \(400 \mathrm{~K}\) under high pressure followed by acid hydrolysis to give [C]

Compound [C] reacts with acetic anhydride / conc. \(\mathrm{H}_2 \mathrm{SO}_4\) to form [D] Identify compound \([\mathrm{D}]\)

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 when [A] is reacted with hot \(\mathrm{KMnO}_4\), it yielded \(\mathrm{CH}_3 \mathrm{COOH}\) and a compound [D] Identify compounds [A], [B] and [D]

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