Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

51.

CH3-CH2-Cl alc. KOH A, the product is :

  • CH3CH2OK

  • CH3CHO

  • CH3CH2OCH2CH3

  • CH2=CH2


D.

CH2=CH2

Alkyl halides undergoes β - elimination in presence of alcoholic KOH, to give unsaturated hydrocarbons. This is also called dehydrodehalogenation of alkyl halides.

CH3.CH2Cl alc. KOH CH2=CH2ethylene + KCl + H2O


52.

Hinsberg's reagent is :


B.

Benzene sulphonyl chloride is called Hinsberg's reagent. This reagent is used to distinguish between primary secondary and tertiary amines.


53.

Which of the following reaction is catalysed by enzyme maltase ?

  • starch  maltose

  • maltose  glucose

  • lactose  maltose

  • maltose  glucose + fructose


B.

maltose  glucose

Maltase enzyme catalyse the conversion of maltose into glucose (2 moles).

C12H22O11maltose +H2OMaltase 2C6H12O6glucose


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54.

The reaction ,

2CH3-CO-OC2H5 C2H5ONa CH3-CO-CH2-CO-OC2H5 + C2H5OH is called :

  • Etard reaction

  • Perkin's reaction

  • Claisen condensation

  • Claisen Schmidt reaction


C.

Claisen condensation

2 molecules of ester condense to give β- keto ester ,in presence of alkali .This reaction is called Claisen condensation .

2CH3-CO-OC2H5 C2H5ONa CH3-CO-CH2-CO-OC2H5ethyl aceto acetate + C2H5OH


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55.

The structural formula of an amino acid, isoleucine is :

  • CH3-CHNH2|-COOH

  • (CH3)2-CH-CHNH2|-COOH

  • CH||C2H5CH3-CHNH2|-COOH

  • (C2H5)2-CH-CHNH2|-COOH


C.

CH||C2H5CH3-CHNH2|-COOH

Isoleucin is an amino-acid. Chemically it is 2-amino-3-methyl pentanoic acid.

CH||C2H5CH3-CHNH2|-COOH


56.

Formaldehyde reacts with ammonia to give urotropine .The formula of urotropine is :

  • (CH2)6N4

  • (CH2)4N3

  • (CH2)6N6

  • (CH2)3N3


A.

(CH2)6N4

HCHO react with ammonia to form hexarnethylene tetramine (urotropine) .This is used as medicine and in making explosive (like RDX) .

6HCHO + 4NH3 (CH2)6N4urotropine + 6H2O


57.

The components of Zeigler Natta catalyst, used in the polymerisation of propylene, are:

  • TiCl3 + Al(C2H5)3

  • TiCl4 + Al(C2H5)3

  • Ti(C2H5)3 + AlCl3

  • Ti(C2H5)4 + AlCl3


B.

TiCl4 + Al(C2H5)3

Zeigler Natta catalyst is an organo-metallic compound, which is used in polymerisation reactions. Its components are TICl4 + Al(C2H5)3.


58.

Phenol reacts with aqueous bromine to give :

  •  + 


D.

OH group in phenol ,activates the benzene ring ,hence it easily reacts with bromine water to give tribromo phenol .

 


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59.

The specific rotation of equilibrium mixture of α - D-glucose and β - D-glucose, is :

  • + 19°

  • + 112°

  • + 52°

  • + 100°


C.

+ 52°

The specific rotation of α - D-glucose is + 113° and that of β - D-glucose is + 19°. The specific rotation of their mixture, in equilibrium, is + 52°.


60.

The cyanohydrin of which compound, gives lactic acid on hydrolysis ?

  • HCHO

  • CH3CHO

  • C6H5CHO

  • CH3COCH3


B.

CH3CHO

Lactic acid is obtained by the hydrolysis of acetaldehyde cyanohydrin.

 H+HOH CH3CH(OH)COOHlactic acid


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