101.

Nitrobenzene on reaction with conc. HNO₃/H₂SO₄ at 80-100°C forms which one of the following products?

• 1, 2-dinitrobenzene

• 1, 3-dinitrobenzene

• 1, 4-dinitrobenzene

• 1, 2, 4-trinitrobenzene

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

• $-\mathrm{C}\equiv \mathrm{N}$

• $-{\mathrm{SO}}_3\mathrm{H}$

• $-\mathrm{COOH}$

• $-{\mathrm{NO}}_2$

The radical  because it has

• 6p-orbitals and 6 unpaired electrons

• 7p-orbitals and 6 unpaired electrons

• 7p-orbitals and 7 unpaired electrons

• 6p-orbitals and 7 unpaired electrons

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

• Cumene

• Xylene

• Nitrobenzene

• Toluene

How nitrobenzene is identified using Mulliken-Barker test?

Which one of the following is s-butyl phenyl vinyl methane?

On mixing alkane with chlorine and irradiating with ultraviolet light, it forms only one monochloroalkane. The alkane is

• Propane

• Pentane 

• Iso-pentane

• Neo-pentane

What is obtained when nitrobenzene is treated sequentially with (i) NH₄Cl/Zn dust and (ii) H₂SO₄/Na₂Cr₂O₇?

• meta-chloronitrobenzene

• para-chloronitrobenzene

• Nitrosobenzene

• Benzene

The addition of HBr to 2-pentene gives

• 2-bromopentane only

• 3-bromopentane only

• 2-bromopentane and 3-bromopentane

• 1-bromopentane and 3-bromopentane

ethylene can be separated from acetylene by passing the mixture through

• fuming H₂SO₄

• pyrogallol

• ammoniacal Cu₂Cl₂

• charcoal powder