Select the correct answer from  the choices A,B, C and D which are given:

Write only the letter corresponding to the correct answer.

An organic compound undergoes additional reactions and gives a red colour precipitate with ammoniacal cuprous chloride. Therefore, the organic compound could be:

• Ethane

• Ethene

• Ethyne

• Ethanol

Select the correct answer from  the choices A,B, C and D which are given:

Write only the letter corresponding to the correct answer.

The organic compound mixed with ethanol to make it spurious is:

• Methanol

• Methanoic acid

• Methanal

• Ethanoic acid

Draw the structural formula for each of the following.

Ethanoic acid

Draw the structural formula for each of the following.

But-2-yne 

Compound  A is bubbled through bromine dissolved in carbon tetrachloride and the product is CH₂Br-CH₂Br.

A   CH₂Br-CH₂Br

i) Draw the structural formula of A.

ii) What type of reaction has A undergone?

iii)What is your observation?

iv)Name (not formula) the compound formed when steam reacts with A in the presence of phosphoric acid.

v) What is the procedure for converting the product  of (b) (iv) back to A?