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NEET Chemistry Solved Question Paper 2011

Multiple Choice Questions

31.

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

SOCl₂ in presence of pyridine

The best method for the conversion of an alcohol into an alkyl chloride is by treating the alcohol with SOCl₂ in the presence of pyridine.

R-OH + SOCl₂ $\to$ R-Cl + HCl +SO₂

The other products being gases escape leaving behind pure alkyl halide.

32.

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

1,1-dichloroethane
1,1,1-trichloroethane
1-chloroethane
1,2-dichloroethane

1,1-dichloroethane

The compound which forms acetaldehyde when heated with dilute NaOH, is1,1-dichloroethane.

33.

The condensation polymer among the following is

rubber
protein
PVC
polyethene

protein

Proteins are the condensation polymers of $α$ -amino acids. Proteins contain peptide -CO-NH bond.

34.

In which of the following, NH₃is 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

Nessler's reagent

Potassium tetraiodo mercurate (II),i.e. K₂[HgI₄] dissolves in KOH solution to give Nessler's reagent. Nesseler's reagent is used to test N $H_{4}^{+}$ ions

35.

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

methanal
propanal
propanone
ethanal

propanal

Propanal is not formed during the dry distillation of a mixture of calcium formate and calcium acetate.

(HCOO)₂Ca $\overset{Dry distillation}{\to}$ HCHO + CaCO₃

(CH₃COO)₂Ca $\overset{∆}{\to}$ CH₃COCH₃ + CaCO₃

(HCOO)₂Ca + (CH₃COO)₂Ca $\overset{∆}{\to}$ 2CH₃CHO + 2CaCO₃

36.

The dispersed phase and dispersion medium in soap lather are respectively

gas and liquid
liquid and gas
solid and gas
solid and liquid

gas and liquid

Soap lather is an example of colloidal system foam, in which the dispersed phase is gas and dispersion medium is liquid.

37.

Cetyltrimethyl ammonium bromide is a popular

anionic detergent
cationic detergent
non-ionic detergent
sweetener

cationic detergent

Cetyltrimethyl ammonium bromide which is a germicide, is a popular cationic detergent.

38.
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

decreases electron density at ortho and para positions

When nitro group is present in the benzene nucleus, it withdraws electrons from ortho andparapositions. 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.

39.

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

$β$ -D-galactose and $β$ -D-glucose

Lactose (milk sugar) is a disaccharide, obtained by the condensation of one molecule of $β$ -D-galactopyranose and one molecule of $β$ -D-glucopyranose.

40.

Amine that cannot be prepared by Gabrielphthalimide synthesis is

aniline
benzylamine
methylamine
iso-butylamine

aniline

Only aliphatic primary amines can be prepared by Gabriel synthesis. Aniline cannot be prepared by this method because aryl halides (C₆H₅Cl or C₆H₅Br) do not undergo nucleophilic substitution with potassium phthalimide under ordinary conditions to give N-phenyl phthalimide(i.e., cleavage of C-X bond in haloarenes is quite difficult).