Rewrite with the missing word/s:

Ethyl alcohol is dehydrated by sulphuric acid at a temperature of about 170°C.

Give suitable chemical term for:
A reaction in which hydrogen of an alkane is replaced by a halogen.

Give a chemical test to distinguish between : Ethene gas and ethane gas.

Give the structural formula for the following :

(i) Methanoic acid

(ii) Ethanal

(iii) Ethyne

(iv) Acetone

(v) 2-methyl propane.