Salicaldehyde is formed by reimer Riemann reaction in which phenol and chloroform are heated together with sodium hydroxide or pottasium hydroxide yeild salicaldehyde.
C6H5OH+CH3Cl ----------> C7H6O2
KOH
It is also prepared by corresponding phenol by duff reaction.
B) polymerization
Polymer is the plural of monomers basically.
A True
Each element consists of one type of atom but, not contains only one atom. It has same type of atoms present in it.