When two double bonds are present on adjacent carbon atoms , the diene is called as :

• conjugated diene

• cumulative diene

• isolated diene

• None of these

B $\stackrel{\mathrm{Lindlar}\text{'}\mathrm{s} \mathrm{catalyst}/{\mathrm{H}}_2}{\leftarrow }$RC$\equiv$CR $\stackrel{\mathrm{Na}/{\mathrm{NH}}_3}{\to }$ A ,

A and B are geometrical isomers (RCH=CHR)

• A is cis , B is trans

• A is trans , B is cis

• A and B both are cis

• A and B both are trans

553.

The homologue of ethyne is :

• C₂H₄

• C₃H₆

• C₃H₃

• C₃H₄

Which of the following is a chiral compound?

• Hexane

• n-Butane

• Methane

• 2,3,4-Trimethylhexane.

Which of the following will show aromatic behaviour ?

• 

• 

• 

• None of these

When trans-2-butene is reacted with Br₂ then product formed is

• 

• 

• Meso compounds

• both (b) and (c)

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