81.

In the mixture of conc. H₂SO₄ and HNO₃ the nitration species is

• N₂O₄

• NO₂⁺

• NO₂

• NO₂^-

Which of the following expression is correct for the first order reactions (C₀ refers to initial concentration and t_1/2 refers to half-life time)?

• ${\mathrm{t}}_{1/2} \infty {\mathrm{C}}_0^0$

• ${\mathrm{t}}_{1/2} \infty {\mathrm{C}}_0^{-1}$

• ${\mathrm{t}}_{1/2} \infty {\mathrm{C}}_0$

• ${\mathrm{t}}_{1/2} \infty {\mathrm{C}}_0^{1/2}$

The IUPAC name of crototonaldehyde is

• prop-2-en-1-al

• propenal

• but-2-en-1-al

• butenal

Carbon-halogen bond is strongest among the following

• CH₃Cl

• CH₃Br

• CH₃F

• CH₃I

Which of the following reacts with phenol to give salicylaldehyde after hydrolysis?

• Dichloro methane

• Trichloro methane

• Methyl chloride

• None of these

Which of the following is most soluble in water?

• Normal butyl alcohol

• Iso-butyl alcohol

• Tertiary butyl alcoho

• None of the above

Ethyl alcohol exhibits acidic character on reacting with

• acetic acid

• sodium metal

• hydrogen iodide

• acidic potassium dichromate

The reaction CH₃CH₂ONa + BrCH₂CH₃ $\stackrel{-\mathrm{NaBr}}{\to }$ CH₃CH₂OCH₂CH₃ is called

• Frankland reaction

• Wurtz reaction

• Williamson's synthesis

• Cannizaro's reaction

Diethyl ether on heating with conc. HI gives two moles of

• ethyl iodide

• ethanol

• Iodoform

• methyl iodide

Schiff's reagent is

• p-rosaniline hydrochloride solution decolourised with sulphurous acid

• magenta solution decolourised with Cl₂

• ammoniacal silver nitrate solution

• alkaline KMnO₄ solution