Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

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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


A.

decreases electron density at ortho and para positions

When nitro group is present in the benzene nucleus, it withdraws electrons from ortho and para positions. Thus, the electron density at the ortho and para positions decreases. Meta position become position of comparatively higher electron density and therefore, electrophilic attack occurs at meta-positions.


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32.

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


33.

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

  • methanal

  • propanal

  • propanone

  • ethanal


34.

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

  • 1,1-dichloroethane

  • 1,1,1-trichloroethane

  • 1-chloroethane

  • 1,2-dichloroethane


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35.

The condensation polymer among the following is

  • rubber

  • protein

  • PVC

  • polyethene


36.

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


37.

Amine that cannot be prepared by Gabriel phthalimide synthesis is

  • aniline

  • benzylamine

  • methylamine

  • iso-butylamine


38.

Lactose is made of

  • α-D-glucose only

  • α-D-glucose and β-D-glucose

  • α-D-galactose and β-D-glucose

  • β-D-galactose and β-D-glucose


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39.

Cetyltrimethyl ammonium bromide is a popular

  • anionic detergent

  • cationic detergent

  • non-ionic detergent

  • sweetener


40.

The dispersed phase and dispersion medium in soap lather are respectively

  • gas and liquid

  • liquid and gas

  • solid and gas

  • solid and liquid


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