Subject

Chemistry

Class

NEET Class 12

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NEET Chemistry Solved Question Paper 2003

Multiple Choice Questions

51.

CH₃-CH₂-Cl $\overset{alc . KOH}{\to}$ A, the product is :

CH₃CH₂OK
CH₃CHO
CH₃CH₂OCH₂CH₃
CH₂=CH₂

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 $\overset{alc . KOH}{\to}$ $\underset{ethylene}{{CH}_{2} = {CH}_{2}}$ + KCl + H₂O

52.

Hinsberg's reagent is :

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 $\to$ maltose
maltose $\to$ glucose
lactose $\to$ maltose
maltose $\to$ glucose + fructose

maltose $\to$ glucose

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

$\underset{maltose}{C_{12} H_{22} O_{11}}$ $\to_{+ H_{2} O}^{Maltase}$ $\underset{glucose}{2 C_{6} H_{12} O_{6}}$

54.
The reaction ,
2CH₃-CO-OC₂H₅ $\overset{C_{2} H_{5} ONa}{\to}$ CH₃-CO-CH₂-CO-OC₂H₅ + C₂H₅OH is called :

Etard reaction

Perkin's reaction

Claisen condensation

Claisen Schmidt reaction

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 $\overset{C_{2} H_{5} ONa}{\to}$ $\underset{ethyl aceto acetate}{{CH}_{3} - CO - {CH}_{2} - CO - {OC}_{2} H_{5}}$ + C₂H₅OH

55.

The structural formula of an amino acid, isoleucine is :

CH₃- $\overset{\underset{|}{{NH}_{2}}}{CH}$ -COOH
(CH₃)₂-CH- $\overset{\underset{|}{{NH}_{2}}}{CH}$ -COOH
$\overset{{CH}_{3}}{\underset{C_{2} H_{5}}{\underset{|}{\overset{|}{CH}}}}$ - $\overset{\underset{|}{{NH}_{2}}}{CH}$ -COOH
(C₂H₅)₂-CH- $\overset{\underset{|}{{NH}_{2}}}{CH}$ -COOH

$\overset{{CH}_{3}}{\underset{C_{2} H_{5}}{\underset{|}{\overset{|}{CH}}}}$ - $\overset{\underset{|}{{NH}_{2}}}{CH}$ -COOH

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

$\overset{{CH}_{3}}{\underset{C_{2} H_{5}}{\underset{|}{\overset{|}{CH}}}}$ - $\overset{\underset{|}{{NH}_{2}}}{CH}$ -COOH

56.

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

(CH₂)₆N₄
(CH₂)₄N₃
(CH₂)₆N₆
(CH₂)₃N₃

(CH₂)₆N₄

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

6HCHO + 4NH₃ $\to$ $\underset{urotropine}{({CH}_{2})_{6} N_{4}}$ + 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

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 :

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

59.

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

+ 19°
+ 112°
+ 52°
+ 100°

+ 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°.