Question and Answers: ethane

1. The outer orbitals of C in ethene molecule can be considered to be hybridized to give three equivalent sp2 orbitals. The total number of sigma (σ) and pi (π) bonds in ethene molecule is

1 sigma (σ) and 2 pi (π) bonds 3 sigma (σ) and 2 pi (π) bonds 4 sigma (σ) and 1 pi (π) bonds 5 sigma (σ) and 1 pi (π) bonds

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2. 'a' and 'b' are van der Waals' constants for gases. chlorine is more easily liquefied than ethane because

a for Cl2 > a for C2H6 but b for Cl2 < b for C2H6 a for Cl2 < a for C2H6 but b for Cl2 > b for C2H6 a and b for Cl2 > a and b for C2H6 a and b for Cl2 < a and b for C2H6

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3. Equal masses of ethane and hydrogen are mixed in any empty container at 25°C. The fraction of total pressure exerted by hydrogen is

1: 2 1 : 1 1 : 16 15: 16

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4. A gas decolourised by KMnO4 solution but gives no precipitate with ammoniacal cuprous chloride is

Ethane Methane Ethene Acetylene

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5. A mixture of ethane and ethene occupies 41 L at 1 atm and 500 K. The mixture reacts completely with 10.3 mole of O2 to produce CO2 and H2O. The mole fractions of ethane and ethene in the mixture are (R = 0.082 L atm K–1mol–1) respectively

0.50, 0.50 0.75, 0.25 0.67, 0.33 0.25, 0.75

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6. The compound which is NOT formed when a mixture of n–butyl bromide and ethyl bromide treated with sodium metal in presence of dry ether is

Butane Octane Hexane Ethane

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7. chlorination of ethane is carried out in presence of

anhydrous AlBr3 mercuric chloride ultraviolet light zinc chloride

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8. chloro ethane reacts with X to form diethyl ether. What is X?

NaOH H2SO4 C2H5ONa Na2S2O3

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9. Acid catalysed hydration of alkenes except ethene leads to the formation of

mixture of secondary and tertiary alcohols mixture of primary and secondary alcohols secondary or tertiary alcohol primary alcohol

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10. ethanol is converted into ethoxy ethane,

by heating excess of ethanol with conc. H2SO4 at 140°C by heating Ethanol with excess of conc. H2SO4 at 443 K by treating with conc. H2SO4 at room temperature by treating with conc. H2SO4 at 273 K

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11. The compound which forms acetaldehyde when heated with dilute NaOH is

1 chloro ethane 1, 1 dichloro ethane 1, 2 dichloro ethane 1, 1, 1 trichloro ethane

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12. $P \underset{2.H_3O^+}{\xrightarrow{\;\;1.CH_3MgBr\;\;}} R \underset{\triangle}{\xrightarrow{\;\;1.dil.NaOH\;\;}}\text{4–methylpent–3–en–2–one}$
P is

propanone ethanamine ethanenitrile ethanal

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13. In the following sequence of reactions

ethanol.jpg" alt="reduction reaction product ethanol" style="margin:0 auto;" />The compound A is

Propane nitrile Ethane nitrile CH3NO2 CH3NC

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14. Themonomer(s) used to prepare polyvinyl polythene is

Vinyl chloride and ethene 1, 3–butadiene Isoprene 1, 3–butadiene and acrylonitrile

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