Which of the following will most stable diazonium salt RN₂⁺X^-?

• CH₃N₂⁺X^-

• C₆H₅N₂⁺X^-

• CH₃CH₂N₂⁺X^-

• CH₃CH₂N₂⁺X^-

Nitrobenzene on reaction with conc. HNO₃/H₂SO₄ at 80-100⁰C forms which one of the following products?

• 1,2-dinitrobenzene

• 1,3- dinitrobenzene

• 1,4-dinitrobenzene

• 1,4-dinitrobenzene

Some meta-directing substituents in aromatic substitution are given. Which one is most deactivating?

• -CN

• -SO₃H

• -COOH

• -COOH

Which of the following compounds will not undergo Friedel -Craft's reaction easily?

• Cumene

• Xylene

• Nitrobenzene

• Nitrobenzene

In the reaction,

• HgSO₄/H₂SO₄

• Cu₂Cl₂

• H₃PO₂ and H₂O

• H₃PO₂ and H₂O

Among the following compounds, the one that is most reactive towards electrophilic nitration is

• Benzoic acid

• Nitrobenzene

• toluene

• toluene

Which of the following reagents will be able to distinguish between 1-butyne and 2-butyne?

• NaNH₂

• HCl

• O₂

• O₂

Consider the reaction,
RCHO +NH₂NH₂ →RCH =N-NH₂
What sort of reaction is it?

• Electrophilic addition elimination reaction

• Free radical addition-elimination reaction

• Electrophilic substitution elimination reaction

• Electrophilic substitution elimination reaction

An organic compound (C₃H₉N) (A), when treated with nitrous acid, gave an alcohol and N₂ gas was evolved. (A) on warming with CHCl₃ and Caustic potash  gave  (C) which on reduction gave  iso-propyl methylamine predict the structure  of (A)

• 

• CH₃-CH₂ -NH -CH₃

• 
• 

640.

What is the product obtained in the following reaction?

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• 
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•