If 27 g of water is formed during complete combustion of pure pro

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 Multiple Choice QuestionsMultiple Choice Questions

61.

What is the possible number of monohydroxy derivatives of a hydrocarbon consisting of five carbon atoms with one methyl group as a branch?

  • 2

  • 3

  • 4

  • 5


62.

Chlorination of ethane is carried out in the presence of

  • anhydrous AlBr3

  • mercuric chloride

  • ultraviolet light

  • zinc chloride


63.

The compound which is not formed when a mixture of n-butyl bromide and ethyl bromide treated with sodium metal in the presence of dry ether is

  • butane

  • octane

  • hexane

  • ethane


64.

The reaction in propene with HBr is presence of peroxide proceeds through the intermediate

  • H3C - C.H - CH3

  • H3C - C.H -CH2Br

  • H3C - CH|Br - C.H2

  • H3C - CH2C.H2


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65.

The total number of monohalogenated products formed by halogenation of 2, 4, 4-trimethylhexane are,

  • 5

  • 7

  • 6

  • 8


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66.

If 27 g of water is formed during complete combustion of pure propene (C3H6), the mass of propene burnt is

  • 42 gm

  • 21 gm

  • 14 gm

  • 56 gm


B.

21 gm

C3H6(Propene)(3 × 12 + 6) + 92O2  3CO2 + 3H2O(3 × 18 = 54 )

Geiven, H2O (formed) = 27 gm

To find the mass of propene, the mass ratio between C3H6 and H2O = 42 : 54

 54 gm of H2O require = 42 gm C3H6

 27 gm of H2O require = 42 × 2754 = 21 gm C3H6


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67.

When methane is heated with dioxygen in the presence of Mo2O3 catalyst, the organic product obtained is

  • methanal

  • ethanoic acid

  • methanol

  • ethanol


68.

The products obtained by the ozonolysis of 2-ethylbut-1-ene are

  • propanone and ethanal

  • methanal and 3-pentanone

  • ethanal and 3-pentanone

  • butanal and ethanal


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69.

When but-2-yne is treated with Na in liquid ammonia

  • cis-2-butene is obtained

  • trans-2-butene is formed

  • n-butane is the major product

  • it rearranges to but-1-yne


70.

When n-hexane is heated with anhydrous AlCl3 and HCl gas, the major product obtained is

  • 1-chlorohexane

  • 2-chlorohexane

  • 3-chlorohexane

  • mixture of 2-methylpentane and 3-methylpentane


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