Assertion (A): Acetylene burns with a sooty flame.

Reason (R): Acetylene contains a greater carbon content.

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R is not the correct explanation of A.
3. A is true but R is false.
4. A is false but R is true.

Assertion (A): On adding ammoniacal silver nitrate to ethyne, it gives a white precipitate.

Reason (R): The above reaction forms silver acetylide.

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R is not the correct explanation of A.
3. A is true but R is false.
4. A is false but R is true.

Choose the correct word/phrase from within the brackets to complete the following sentences:

(i) The catalyst used for conversion of ethene to ethane is commonly …………… (nickel/iron/cobalt)

(ii) When acetaldehyde is oxidized with acidified potassium dichromate, it forms …………… (ester / ethanol / acetic acid)

(iii) Ethanoic acid reacts with ethanol in the presence of concentrated H₂SO₄, so as to form a compound and water. The chemical reaction which takes place is called …………… (dehydration/hydrogenation/esterification)

(iv) Write the equation for the reaction taking place between 1,2-dibromoethane and alcoholic potassium hydroxide.

(v) The product formed when ethene gas reacts with water in the presence of sulphuric acid …………… (ethanol / ethanal / ethanoic acid)

From the following organic compounds given below, choose one compound in each case which relates to the description [i] to [iv]:

[Ethyne, ethanol, acetic acid, ethene, methane].

(i) An unsaturated hydrocarbon used for welding purposes.

(ii) An organic compound whose functional group is carboxyl.

(iii) A hydrocarbon which on catalytic hydrogenation gives a saturated hydrocarbon.

(iv) An organic compound used as a thermometric liquid.