The SN1 reactivity of the following halides will be in the order(

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 Multiple Choice QuestionsMultiple Choice Questions

91.

Which of the following is a double base propellant ?

  • Methyl nitrate and nitromethane

  • Nitroglycerine and nitrocellulose

  • Kerosine and alcohol

  • Acrylic rubber and liquid N2O4


92.

Which one of the following compounds is capable of existing in a mesa form?

  • 2,4-dibromopentane

  • 3,3-dibromopentane

  • 4-bromo-2-pentanol

  • 3-bromo-2-pentanol


93.

Which of the following is not true of carbanions?

  • The carbon carrying the charge has eight valence electrons

  • They are formed by heterolytic fission

  • They are paramagnetic

  • The carbon carrying the charge is sp3 hybridised


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94.

The SN1 reactivity of the following halides will be in the order

(i) (CH3)3CBr

(ii) (C6H5)2CHBr

(iii) (C6H5)2C(CH3)Br

(iv) (CH3)2CHBr

(v) C2H5Br

  • (iii) > (ii) > (i) > (iv) > (v)

  • (v) > (iv) > (i) > (ii) > (iii)

  • (ii) > (i) > (iii) > (v) > (iv)

  • (v) > (i) > (ii) > (iv) > (iii)


A.

(iii) > (ii) > (i) > (iv) > (v)

Rate ∝ substrate

Rate of determining step in the formula of carbocation depends on the stability of carbocation formed. Hence, the stability of carbocations follow the order-

(C6H5)2C+(CH3) > (C6H5)2CH > (CH3)2CH > CH3CH2+

Therefore, order of SN1 reactivity is-

(C6H5)2C(CH3)Br > (C6H5)2CHBr > (CH3)3CBr > (CH3)2CHBr > C2H5Br


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95.

Which of the following does not answer iodoform test?

  • n-butyl alcohol

  • sec-butyl alcohol

  • Acetophenone

  • Acetaldehyde


96.

Aniline on treatment with NaNO2 in HCl at 0°C followed by treatment with alkaline β-naphthol gives:

  • a violet solution

  • a red solution

  • a green solution

  • a blue precipitate


97.

Wurtz's reaction involves the reduction of alkyl halide with :

  • Zn/ HCl

  • HI

  • Zn/ Cu couple

  • Na in ether


98.

The compound that does not answer iodoform test is :

  • ethanol

  • ethanal

  • methanol

  • propanone


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99.

Best method of preparing alkyl chloride is

  • ROH + SOCl2 → 

  • ROH + PCl5 → 

  • ROH + PCl3 →

  • ROH + HCl AnhyZnCl2


100.

Acetylene can be obtained by the reaction

  • HCOOK Electrolysis

  • CHI3 + Ag 

  • CH3CH2OH 443KConc. H2SO4

  • Be2C + H2O →


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