Presence of nitrogen in which among the following compounds can not be detected by Lassaigne method?

• Hydrazine

• Aniline

• p-toluidine

• Picric acid

The hottest region of Bunsen flame shown in the figure below is:

• region 2

• region 3

• region 4

• region 4

The distillation technique most suited for separating glycerol from spent-lye in the soap industry is:

• fractional distillation

• steam distillation

• distillation under reduced pressure

• distillation under reduced pressure

For which of the following molecule significant μ≠ 0?

• only a

• a and b

• Only c

• Only c

Which branched chain isomer of the hydrocarbon with molecular mass 72u gives only one isomer of mono substituted alkyl halide?

• Tertiary butyl chloride

• Neopentane

• Isohexane

• Isohexane

Identify the compound that exhibits tautomerism

• 2-Butene

• Lactic acid

• 2-Pentanone

• 2-Pentanone

Which of the following molecules is least resonance stabilized?

The IUPAC name of neopentane is

• 2-methylbutane

• 2, 2-dimethylpropane

• 2-methylpropane

• 2-methylpropane

9.

The electrophile, E^⊕ attacks the benzene ring to generate the intermediate σ-complex. Of the following, which σ-complex is of lowest energy? 

• 
• 
• 
• 

Which one of the following is the correct statement?

• Boric acid is a protonic acid

• Beryllium exhibits coordination number of six

• Chlorides of both beryllium and aluminium have bridged chloride structures in solid phase

• Chlorides of both beryllium and aluminium have bridged chloride structures in solid phase