Give reasons for the following –

(i) almost 90% of all known compounds are organic in nature.

(ii) it is dangerous to burn methane in an insufficient supply of air.

Draw the structural formula of —

(i) Ethanoic acid

(ii) But-2-yne

Compound 'X' is bubbled through bromine dissolved in CCl₄ and the product formed is CH₂Br – CH₂Br.

i) Draw the structural formula of 'X' and state what type of reaction 'X' has undergone.

(ii) State your observation for the above reaction.

(iii) Name the compound formed when steam reacts with 'X' in the presence of an acid, eg. phosphoric acid.

(iv) What is the procedure for converting the product formed in (iii) above, back to 'X' ?

Choose the correct answer:

The functional group present in acetic acid is

A: Ketonic C = O
B: Hydroxyl - OH
C: Aldehydic – CHO
D: Carboxyl – COOH