Fill in the blanks with the correct words from the brackets:
(a) Alkenes are the (i) ............... (analogous/homologous) series of (ii) ............... (saturated/unsaturated) hydrocarbons. They differ from alkanes due to the presence of (iii) ............... (double/single) bonds. Alkenes mainly undergo (iv) ............... (addition/substitution) reactions.
(b) The organic compound which undergoes substitution reaction is (v) ............... (C2H2, C2H4, C10H18, C2H6)
(c) Draw the structural formulae of the two isomers of Butane. Give the correct IUPAC name of each isomer.
(a) Alkenes are the (i) homologous series of (ii) unsaturated hydrocarbons. They differ from alkanes due to the presence of (iii) double bonds. Alkenes mainly undergo (iv) addition reactions.
(b) The organic compound which undergoes substitution reaction is (v) C2H6.
(c) The correct IUPAC names of isomers of Butane are Butane and 2-Methyl propane. Their structural formulae are given below:
- Butane [n-butane]

- 2-Methyl propane [iso-butane]
