Which of the following species participate in sulphonation of benzene ring?

• H₂SO₄

• SO₃

• HSO${}_3^{-}$

• SO${}_2^{-}$

Geometrical isomerism is found in :

• pentene - 1

• pentane

• 2 - butene

• butene - 1

The reagent used in Gatterman Koch aldehyde synthesis is :

• Pb/BaSO₄

• alkaline KMnO₄

• acidic KMnO₄

• CO + HCl

Cetane is a compound which has very good ignition property .Chemically it is :

• CH₃(CH₂)₁₄CH₃

• (CH₃)₃C(CH₂)₁₁CH₃

• C₁₇H₃₄

• None of the above

The electrophile involved in the nitration of benzene is :

• NO₂

• NO₂⁺

• NO

• NO₂^-

Which of the following gives propyne on hydrolysis?

• Al₄C₃

• Mg₂C₃

• B₄C

• La₄C₃

What is obtained , when propene is treated with N-bromo succinimide ?

• CH₃-CBr=CH₂

• BrCH₂-CH=CH₂

• BrCH₂-CH=CHBr

• BrCH₂-CHBr-CH₂Br

Poisonous gas 'Lewisite' is obtained by the reaction of :

• CH$\equiv$CH and AsCl₃

• CH₂=CH₂ and AsCl₃

• CH$\equiv$CH and S₂Cl₂

• CH₂=CH₂ and NOCl

69.

Assertion : [Co(NO₂)₃(NH₃)₃] does not show optical isomerism.

Reason : It has a plane of symmetry.

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

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

• If assertion is true, but reason is false.

• Both assertion and reason are false statements.

What will be the main product, when benzene vapours are passed over V₂O₅ at 450°C ?