Yogi Vemana University 2009 ICSE Important for : Chemistry : Organic Chemistry - Question Paper

(vii) Draw the structural formula of ethyne. How does the structure of alkynes differ from that of alkenes.

(viii) Fill in the blanks with the accurate words : – Alkanes are the (a) _______ [analogous / homologous] series of (b) _______ [saturated / unsaturated] hydrocarbons. They differ from alkanes due to the presence of (c) _________ [double / single] bonds. Alkenes mainly undergo (d) ________ [addition / substiution] reactions.


ques. .6. (i) Which compound is heated with soda lime to find C2H6 in the laboratory . Write the formula for the identical.

(ii) Write the formula for the preparation of CH4 from anhydrous sodium ethanoate [sodium acetate].


ques. .7. (i) What kind of reaction has taken place ranging from ethane and chlorine.

(ii) Write the formula of the complete combustion of ethane.

(iii) What is the kind of reaction taking place ranging from ethane and chlorine to form mono-chloro-ethane.

(iv) Write the formula for the preparation of carbon tetrachloride from methane.

(v) Write a balanced formula for the reaction of ethane and oxygen in presence of molybdenum oxide.


ques. .8. (i) Name a solid used instead of conc. H2SO4to prepare ethylene by the dehydration of ethanol.

(ii) Write the formula for the preparation of ethylene from ethyl alcohol.
Or,
Write the formula for the reaction of heating ethanol at 170ºC in the presence of conc. H2SO4.



ques. .9. (i) Write a balanced formula for the reaction ranging from ethene and hydrogen.

(ii) State what do you observe when ethene is bubbled through a solution of bromine in tetrachloromethane (carbon tetrachloride).

(iii) The reaction ranging from ethene and chlorine forms only 1 product. Name the kind of this formula.

(iv) Ethylene forms an addition product with Cl2. Name the product and provide its structural formula.

ques. .10. (i) Write down the formula for the preparation of ethyne from calcium carbide.

(ii) Burning of acetylene (ethyne) in oxygen produces a very hot flame. What is this hot flame used for.

(iii) State 1 use of acetylene.


ques. .11. (i) What is the kind of reaction ranging from ethene and chlorine.

(ii) What feature of the ethene structure makes such a reaction possible.

(iii) Name the product of the reaction ranging from ethene and chlorine.

(iv) What is the special feature of the structure of ethyne.

(v) Ethanol can be converted to ethene which can then be changed to ethane. select the accurate word or phrase from the brackets to complete the subsequent phrases : -

(a) The conversion of ethanol to ethene is an example of ______ (dehydration / dehydrogenation).

(b) Converting ethanol to ethene requires the use of ________ (concentrated hydrochloric acid / concentrated nitric acid / concentrated sulphuric acid).

(c) The conversion of ethene to ethane is an example of _______ (hydration / hydrogenation).

(d) The catalyst used in the conversion of ethene to ethane is commonly ________ (iron / nickel / cobalt).

(vi) From the list provided : - ethanol, ethane, methanol, methane, ethyne and ethene. Name a compound : -

(a) Formed by the dehydration of ethanol by concentrated sulphuric acid.

(b) Which will provide a red precipitate with ammoniacal cuprous chloride solution.

(c) Which forms methanoic acid on oxidation in the presence of copper at 200ºC.

(d) Which has vapour density 14 and turns alkaline KMnO4 green.

(e) Which forms chloroform on halogenation in the presence of sunlight.

(f) Which decolourises bromine solution in carbon tetrachloride.

(vii) Write balanced equations for the preparation of the subsequent : -

(a) Ethane from sodium propionate (b) Ethene from ethanol. (c) Ethyne from calcium carbide. (d) Ethanoic acid from ethane.

(viii) Name a reagent which can be used to distinguish ranging from Ethane and ethene.

(ix) Write the formula for the preparation of ethylene from ethyl alcohol.

(x) Name a compound which will provide acetylene gas when treated with water.

(xi) Write the equations for the subsequent laboratory preparations : -

(a) Ethane from sodium propionate. (b) Ethene from Iodoethane. (c) Ethyne from calcium carbide. (d) Methanol from Iodomethane.

(xii) Draw the structural formula of a compound with 2 carbon atoms in every of the subsequent cases : - (a) An alkane with a carbon to carbon single bond.

(b) An alcohol containing 2 carbon atoms.

(c) An unsaturated hydrocarbon with a carbon to carbon triple bond.

Earning:   Approval pending.