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

Workspace

Discuss

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

Workspace

Discuss

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

Workspace

Discuss

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

Ethane Methane Ethene Acetylene

Workspace

Discuss

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

Workspace

Discuss

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

Workspace

Discuss

7. chlorination of ethane is carried out in presence of

anhydrous AlBr3 mercuric chloride ultraviolet light zinc chloride

Workspace

Discuss

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

NaOH H2SO4 C2H5ONa Na2S2O3

Workspace

Discuss

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

Workspace

Discuss

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

Workspace

Discuss

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

Workspace

Discuss

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

Workspace

Discuss

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

Workspace

Discuss

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

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

Workspace

Discuss