(b) Addition polymers are obtained by the polymerisation of olefins and without the loss of small molecules such as $H _{2} O$ and $NH _{3}$
(c) Condensation polymers are obtained with the loss of small molecules such as $H _{2} O$ and $NH _{3}$
(d) Homopolymers contain monomer units of only one kind. Since, bakelite is a polymer of formaldehyde $( HCHO )$ and phenol $\left( C _{6} H _{5} OH \right)$ and formed with the loss of water molecules, it is a synthetic condensation copolymer.