Which among of the following alkyne will give an aldehyde on hydroboration oxidation reaction?

1. $\mathrm{CH}\equiv \mathrm{CH}$

2. ${\mathrm{CH}}_3-{\mathrm{CH}}_2-\mathrm{C}\equiv \mathrm{C}-\mathrm{H}$

3. ${\mathrm{CH}}_3-\mathrm{C}\equiv \mathrm{C}-\mathrm{H}$

4. All of these

Reductive ozonolysis of the alkene, ${\mathrm{CH}}_3-\mathrm{CH}=\mathrm{C}={\mathrm{CH}}_2$ will give:

1. Only ${\mathrm{CO}}_2$

2. Only ${\mathrm{CH}}_2\mathrm{O}$

3. Only ${\mathrm{CH}}_3-\mathrm{CHO}$

4. Mixture of ${\mathrm{CH}}_3\mathrm{CHO},\mathrm{HCHO} \mathrm{and} {\mathrm{CO}}_2$

The reaction intermediate involved in the addition of \(\mathrm{HBr}\) to propene in the absence of peroxides is:

Toluene refluxed with Br₂ in the presence of light generates mainly:

1. p-Bromotoluene.

2. Benzyl bromide.

3. o-Bromotoluene.

4. Mixture of o- and p-bromotoluene.

Ethene and ethyne can be distinguished by:

1. Br₂ water

2. KMnO₄ solution

3. Cuprous chloride solution

4. All of the above

The product(s) obtained via oxymercuration (HgSO₄ + H₂SO₄ ) of but-1-yne is -

1. ${\mathrm{CH}}_3{\mathrm{CH}}_2-\stackrel{\stackrel{\mathrm{O}}{\left|\right|}}{\mathrm{C}}-{\mathrm{CH}}_3$

2. CH₃CH₂ CH₂-CHO

3. CH₃CH₂CHO + HCHO

4. CH₃ CH₂COOH + HCOOH

Propyne and propene can be distinguished by:

1. Conc. H₂SO₄

2. Br₂ in CCl₄

3. Diluted H₂SO₄

4. AgNO₃ in ammonia

Which alkene among the following reacts the fastest with H₂​ under catalytic conditions?
 

1.		2.
3.		4.

The product formed on reaction of HBr with propene is-

1. 1-bromopropane

2. 2-bromopropane

3. 3-bromopropane

4. no reaction occurs

The reaction of HBr with 

 in the presence of peroxide will give:

1.
2.
3.
4.