How would you distinguish between Propene and Propyne.

What is electrophile in sulphonation?

Explain the reasons for extra ordinary stability of benzene in spite of presence of three double bonds in it.

Explain why p-xylene has higher melting point than the corresponding ortho or meta- isomers.

Why does benzene undergo electrophilic substitution reactions easily and nucleophilic substitutions with difficulty?

Write chemical equation for combustion reaction of toluene.

Identify the structure of A and B
\({ CH }_{ 3 }-CH_{ 2 }COOH \ \underrightarrow { KOH } \ A\underrightarrow { \ Kobbe's \ electrolysis } \ B\)
\({ CH }_{ 3 }-CH_{ 2 }COOH \ \underrightarrow { KOH } { \ CH }_{ 3 }CH_{ 2 }COO^{ - }{ K }^{ + } \ \underrightarrow { Kolbe's \ electolysis } { \ CH }_{ 3 }CH_{ 2 }CH_{ 2 }{ CH }_{ 3 }\\ \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad A\quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad B\)

Why do the C- C bonds rather than C - H bonds break during cracking of alkanes?

n-propylmagnesium bromide on hydrolysis gives propane. Is there any other Grignard reagent which also gives propane? If so, give its name, structure and equation for the reaction.

Rotation around carbon-carbon single bond of ethane is not completely free. Justify the statement.

On converting benzene to toluene, state whether there will be a rise or fall in the melting point.

Why do you alkenes prefer to undergo electrophilic addition reaction while arenes prefer electrophilic substitution reactions? Explain.

Out of benzene, m–dinitrobenzene and toluene which will undergo nitration most easily and why?

An alkane has a molecule mass of 72. Give all the possible structural isomers along with their IUPAC names.

In the presence of peroxide, addition of HBr to propene takes place according to anti-Markownikoff's rule but peroxide effect is not seen in the case of HCl and HI. Explain.

Which of the following compounds will show cis-trans isomerism?
(CH₃)₂C=CH-C₂H₅

Which of the following compounds will show cis-trans isomerism?
CH₂= CBr₂

Arrange the following set of compounds in order of their decreasing relative reactivity with an electrophile, E+.
(i) Chlorobenzene, 2, 4-dinitrochlorobenzene, p-nitrochlorobenzene
(ii) Toluene,  \(p-{ H }_{ 3 }C-{ C }_{ 6 }{ H }_{ 4 }-{ NO }_{ 2 },\)
\(p-{ O }_{ 2 }N-{ C }_{ 6 }{ H }_{ 4 }-{ NO }_{ 2 }\)
Also explain ur answer.