Which of the following is a double base propellant ? from Chemis

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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


B.

Nitroglycerine and nitrocellulose

The molecules which contain both the oxidiser and the fuel elements in the same molecule are called double base propellants, for e.g., nitroglycerine and nitrocellulose.

Nitrocellulose gels in nitroglycerine and sets to a solid mass.


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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


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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