31.

In electrophilic aromatic substitution reaction, the nitro group is meta directing because it

• decreases electron density at ortho and para positions

• decreases electron density at meta position

• increases electron density at meta position

• ncreases electron density at ortho and para positions

The best method for the conversion of an alcohol into an alkyl chloride is by treating the alcohol with

• PCl₃

• PCl₅

• SOCl₂ in presence of pyridine

• dry HCl in the presence of anhydrous ZnCl₂

The compound which is not formed during the dry distillation of a mixture of calcium formate and calcium acetate is

• methanal

• propanal

• propanone

• ethanal

The compound which forms acetaldehyde when heated with dilute NaOH, is

• 1,1-dichloroethane

• 1,1,1-trichloroethane

• 1-chloroethane

• 1,2-dichloroethane

The condensation polymer among the following is

• rubber

• protein

• PVC

• polyethene

In which of the following, NH₃ is not used?

• Tollen's reagent

• Nessler's reagent

• Group reagent for the analysis of IV group basic radicals

• Group reagent for the analysis of III group basic radicals

Amine that cannot be prepared by Gabriel phthalimide synthesis is

• aniline

• benzylamine

• methylamine

• iso-butylamine

Lactose is made of

• $\mathrm{\alpha }$-D-glucose only

• $\mathrm{\alpha }$-D-glucose and $\mathrm{\beta }$-D-glucose

• $\mathrm{\alpha }$-D-galactose and $\mathrm{\beta }$-D-glucose

• $\mathrm{\beta }$-D-galactose and $\mathrm{\beta }$-D-glucose

Cetyltrimethyl ammonium bromide is a popular

• anionic detergent

• cationic detergent

• non-ionic detergent

• sweetener

The dispersed phase and dispersion medium in soap lather are respectively

• gas and liquid

• liquid and gas

• solid and gas

• solid and liquid