Hydrocarbons

Assertion : Phenol is more reactive than benzene towards electrophilic substitution reaction.

Reason : In the case of phenol, the intermediate carbocation is more resonance stabilised.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.

Degree of unsaturation of A= 2 double or triple bond. Identify A.

• 

• 

• 

• None of these 

Assertion: Cis-2-butene gives meso-2, 3-butanediol with dilute alkaline KMnO₄ solution.

Reason : Dilute alkaline KMnO₄ solution gives trans addition with alkenes.

• If both assertion and reason are true and reason is the correct explanation of assertion

• If both assertion and reason are true but reason is not the correct explanation of assertion

• If assertion is true but reason is false

• If both assertion and reason are false

Assertion : The presence of Ag⁺ enhances the solubility of alkenes in water.

Reason : Alkenes are weakly polar in nature.

• If both assertion and reason are true and reason is the correct explanation of assertion

• If both assertion and reason are true but reason is not the correct explanation of assertion

• If assertion is true but reason is false

• If both assertion and reason are false

Identify the final product.

• 

• 

• 

• None of these

CH$\equiv$CH $\underset{{\mathrm{H}}_2{\mathrm{SO}}_4}{\overset{{\mathrm{HgSO}}_4}{\to }}$ $\underset{{\mathrm{H}}_2\mathrm{O}}{\overset{{\mathrm{CH}}_3\mathrm{MgBr}}{\to }}$ $\stackrel{\mathrm{P}/{\mathrm{Br}}_2}{\to }$

• CH₃CH(Br)CH₃

• CH₃CH₂CH₂Br

• CH₂=CH-Br

• BrCH=CH-CH₃

Number of bonds in benzene :

• 6$\mathrm{\sigma }$ and 3$\mathrm{\pi }$

• 12$\mathrm{\sigma }$ and 3$\mathrm{\pi }$

• 3$\mathrm{\sigma }$ and 12$\mathrm{\pi }$

• 6$\mathrm{\sigma }$ and 6$\mathrm{\pi }$

Propene on hydroboration and oxidation produces

• CH₃CH₂CH₂OH

• CH₃CHOHCH₃

• CH₃CHOHCH₂OH

• CH₃CH₂CHO

${\mathrm{C}}_6{\mathrm{H}}_{6 }\underset{{\mathrm{H}}_2{\mathrm{SO}}_4}{\overset{{\mathrm{HNO}}_3}{\to }} \mathrm{X} \underset{{\mathrm{FeCl}}_3}{\overset{{\mathrm{Cl}}_2}{\to }} \mathrm{Y}$

In the above sequence Y can be

• 3-nitrochlorobenzene

• 1-nitrochlorobenzene

• 4-nitrochlorobenzene

• none of these

Which of the following is aromatic?