Which one of the following compounds is capable of existing in a

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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


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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


A.

2,4-dibromopentane

Those compounds which contain two or more asymmetric carbon atoms but are optically inactive due to presence of plane of symmetry, are called mesa compounds. Mesa compounds are optically inactive due to internal compensation.

Out of the given compounds only 2,4-dibromopentane have a plane of symmetry, so it is a mesa compound.

                              


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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


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)


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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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