Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

51.

Which is correct example of condensation polymer?

  • Nylon, Buna-S

  • Teflon, Buna-N

  • Nylon 6,6, Dacron

  • Neoprene, Buna-S


C.

Nylon 6,6, Dacron

Nylon 6, 6 and dacron are the examples of condensation polymers. Condensation polymers are formed by condensation of two or more bifunctional monomers with the elimination of simple molecules like H2O, NH3, alcohol, etc. Dacron is formed from ethylene glycol and terephthalic acid with the removal of H-O. Nylon 6, 6 is formed from hexamethylenediamine and adipic acid with the removal of HO.


52.

Which is the major product formed when C6H5CONHC6H5 undergoes nitration?


B.

The ring attached to the nitrogen atom in benzanilide is strongly activated towards electrophilic substitution reaction.
:. Nitration occurs at p-position to the ring attached to 'N' atom.


53.

Nitrobenzene (PhNO2Zn + NH4ClP ?

  • C6H5NH2

  • C6H5NHOH

  • C6H5-N=O

  • C6H6


B.

C6H5NHOH

In neutral medium, nitrobenzene reduces to phenylhydroxylamine.


54.

If phthalic acid is treated with NH3 and then it is first heated weakly then strongly, the final product formed is


D.


55.

But-1-ene H3O(CH3COO)2?

The product in the above reaction is

  • CH3CH2CH2CH2OH

  • CH3CH2CH(OH)CH3

  • CH2=CH2CH(OH)-CH3

  • CH3-CH=C(OH)-CH3


A.

CH3CH2CH2CH2OH


56.

Assertion : The solubility of a gas in a liquid increases with increase of pressure.

Reason : The solubility of a gas in a liquid is directly proportional to the pressure of the gas.

  • If both assertion and reason are true and reason is the correct explanation of assertion.

  • If both assertion and reason are true but reason is not the correct explanation of assertion.

  • If assertion is true but reason is false.

  • If both assertion and reason are false.


A.

If both assertion and reason are true and reason is the correct explanation of assertion.

This is according to Henry's law which states that the solubility of a gas in given volume of a liquid at a particular temperature is directly proportional to the pressure of gas above the liquid. m  p, m = kp where k= Henry's constant.


57.

PhCH2Cla.q. NaCl? Catalytic hydrogenation(U)

The final product (U) is:

  • C6H5CH2CH2NH2

  • C6H5CH2CONH2

  • C6H5CH2NH2

  • C6H5CH2NHCH3


A.

C6H5CH2CH2NH2

PhCH2Cla.q NaCNPhCH2CNCat.hydrogenationH2,PdPhCH2CH2NH2

                                                                (U)


58.

In a set of reactions, acetic acid yielded a product S,

CH3COOH SOCl2 P  Anhy. AlCl3Benzene Q HCN R HOHS

The structure of S would be


A.


59.

An aromatic compound C7H6Cl(A), gives AgCl on boiling with alcoholic AgNO2 solution and yields C,HOCI on treatment with sodium hydroxide. (A) on oxidation gives monochlorobenzoic acid. The compound (A) is:


A.


60.

Assertion: HC= C- is more stable than H2C CH-
Reason : HC C- has more s-character than HC= CH-

  • If both assertion and reason are true and reason is the correct explanation of assertion.

  • If both assertion and reason are true but reason is not the correct explanation of assertion.

  • If assertion is true but reason is false.

  • If both assertion and reason are false.


A.

If both assertion and reason are true and reason is the correct explanation of assertion.

HCC- has 50% s-character and H2C=CH- has 33% s-character. Stability ofcarbanions increases with an increase in the s-character at the carbanion. So HCC- is more stable than H2C= CH-.