Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

41.

CH3CHI2 KCN H2O ,  ?

Here the end product would be :

  • 2 - cyano propionic acid

  • ethane - l , 1 - dicarboxylic acid

  • 2 - methyl ethanoic acid

  • propionic acid


D.

propionic acid


42.

2 - pentanone and 3 - pentanone can be distinguished by :

  • cannizaro's reaction

  • iodoform reaction

  • aldol condensation

  • Clemmensen's reduction


B.

iodoform reaction

2 - pentanone and 3 - pentanone can be distinguished by iodoform test .

CH3COCH2CH2CH3 (2-pentanone) gives positive test of iodoform test while

CH3CH2COCH2CH3 (3-pentanone) does not give iodoform test .


43.

Proteins are :

  • polypeptides with low molecular weights

  • polypeptides with high molecular weights

  • polymers of amides

  • polymers of secondary amines


B.

polypeptides with high molecular weights

Proteins are polypeptides with high molecular weight .These are the polymer of amino acids .Proteins are essential for growth and repairing of tissue .


44.

Hydrolysis of lactose with dilute acid yields :

  • D - glucose + D - glucose

  • D - glucose + D - galactose

  • D - glucose + D - fructose

  • D - galactose + D - fructose


B.

D - glucose + D - galactose

Lactose is hydrolysed with dilute acid or by the lactase enzyme into D-glucose and D-galactose .

C12H22O11lactose + H2dil. HCl C6H12O6glucose  + C6H12O6galactose


45.

Which is used to obtain salicylic acid from phenol ?

  • CCl4

  • CHCl3

  • CH3COOH

  • COCH3


A.

CCl4

When phenol reacts with CCl4 it gives salicylic acid .


46.

CH3Br + KCN (alco.)  X Na + C2H5OHReduction Y

What is Y in the series ?

  • CH3CN

  • C2H5CN

  • C2H5NH2

  • CH3NH2


C.

C2H5NH2

CH3Brmethyl bromide + KCN(alco.)  CH3CH(X) Na + C2H5OHReduction CH3CH2NH2ethyl amine (Y)


47.

Dehydration of glycerol produces :

  • propanone

  • allyl alcohol

  • glycol

  • acrolein


D.

acrolein

Dehydration of glycerol with KHSO4 , gives acrolein .


48.

Which of the following is an ester ?

  • Coconut oil

  • Kerosene oil

  • Soap

  • Glycerine


A.

Coconut oil

Fats and oils are esters of glycerol with higher fatty acids .Hence , coconut oil is an ester .


49.

Identify the 'C' in the reaction :

RNH2 HNO2 A + B + C

  • NH3

  • O2

  • N2

  • CO2


C.

N2

When primary amine reacts with nitrous acid ,nitrogen gas is evolved .

RNH2 + HNO2  ROH(A) + H2O(B) + N2 (C)


50.

Which will give cannizaro reaction ?

  • Cl3C-CHO

  • C6H5CHO

  • (CH3)3-C-CHO

  • All of the above


D.

All of the above

Aldehyde containing no α - hydrogen atom gives cannizaro reaction .Hence , all of these will give cannizaro reaction because they do not contain α - hydrogen atom.