Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

51.

Compound reacting with alkaline KMnO4 :

  • (CH3)3-C-OH

  • (CH3)2-CH-OH

  • (CH3)3-C-CH2OH

  • none of the above


B.

(CH3)2-CH-OH

Only 1° alochol and 2° alcohol react withalkaline KMnO4 .

(CH3)2-CH-OHAlcoholKMnO4CH3-CO||-CH3Ketone[O]CH3COOHAcid


52.

HCHO reacts with NH3 togive :

  • urotropine

  • bakelite

  • teryline

  • gylaptal


A.

urotropine

Formaldehyde reacts with ammonia toproduce urotropine as follows :

6HCHO + 4NH3(CH2)6N4Urotropine+ 6H2O


53.

Lucas reagent reacts fastest with :

  • butanol - 1

  • butanol - 2

  • 2 - methyl - propanol - 2

  • 2 - methyl - propanol - 1


C.

2 - methyl - propanol - 2

Lucas reagent (ZnCl2/HCl)reacts fastest with3° alcohols such as 2 - methyl propanol - 2 [(CH3)3-C-OH] .


54.

Phenol and benzoic acid may bedistinguished by :

  • NaHCO3

  • NaOH

  • Na

  • PCl5


A.

NaHCO3

Phenol and benzoic acid can bedistinguished by NaHCO3 .Beingstronger acid , only benzoic acid reactswith it .


55.

SN2mechanism is involed in thefollowing substitution :

  • CH3-CH2-Cl + OH-

  • (CH3)2-C(Cl)-CH3-OH-

  • (CH3)2-C-Cl + OH-

  • CH3-CH2-(CH3)C(Cl)-CH3 + OH-


A.

CH3-CH2-Cl + OH-

Primary halide undergoes alkaline hydrolysis through SN2mechanism .


56.

ZPClXalc.KOHYconc.H2SO4Z

Here Z is :

  • CH3-CH2-CH2-OH

  • (CH3)2-C-OH

  • CH3-CH(OH)-CH3

  • none of above


C.

CH3-CH(OH)-CH3

CH3-CH(OH)-CH3PCl5 CH3-CH(Cl)CH3alc.KOHCH3-CH=CH2H2O/conc.H2SO4Z


57.

Aniline with CHCl3 and KOHon heating gives :

  • isocyanide

  • cyanide

  • phenol

  • salicylic acid


A.

isocyanide

Aniline reacts with CHCl3 and KOHas follows ;

C6H5NH2Aniline+ CHCl3 + 3KOH(alc.)C6H5N=CPhenylisocyanide+ 3KCl + 3H2O


58.

Correct order of basic nature is :

  • NH3 > CH3NH2 > C6H5NH2

  • C6H5NH> NH3 > CH3NH2

  • CH3NH> NH3 > C6H5NH2

  • none of the above


C.

CH3NH> NH3 > C6H5NH2

Correct order of basic nature is :

CH3NH2>NH3>C6H5NH2


59.

Arrange the hydra - acids of halogens inincreasing order of acidity .

  • HF < HCl < HBr < HI

  • HI < HBr < HCl < HF

  • HF < HBr < HI <HCl

  • HF < HI < HBr < HCl


A.

HF < HCl < HBr < HI

Hydra - acids of halogens in increasingorder of acidity :

HF < HCl < HBr < HI

As the strength of hydrogen bondingdecreases in the order of :

HF > HCl > HBr > HI


60.

Most acidic is :


D.

Phenol is acidic in nature and the acidicnature of phenol is increased by thepresence of - I (electron attracting) groupsat o - and / or p - position of the - OHgroup .However benzoic acid is moreacidic than nitro - phenol .