• Polymers can be classified into three main types based on structure. These are linear polymers, branched chain polymers and cross- linking polymers.
• Linear polymers are formed of long, straight chains. Examples of this type include high density polythene (HDP), polyvinyl chloride etc.
• Branched chain polymers contain of linear chains having branches. Some examples include low density polythene etc.
• Cross linking polymers are also called network polymers and are usually formed from bi-functional and tri-functional monomers.
• These contain very strong covalent bonds between various linear polymer chains. Examples of cross-inking polymers include Bakelite, Melamine formaldehyde resin etc.
• The addition of HCN to D-Glucose leads to the formation of D-Gluconitrile and D-Mannononitrile.
• The addition of cyanide to the aldehyde group lengthens the glucose chain by 1 atom which generates a new stereo centre through which 2 configurations are possible.
• The structures of the produced compounds are as follows
• One of the secondary structures of proteins is and alpha helix structure.
• The stability of this structure is attributed to the hydrogen bonding between the hydrogen of the amino group of the nth amino acid and the oxygen of the carbonyl group of the (n+4)th amino acid.
• The main deficiency caused by lack of Vitamin B12 is Beri-Beri.
• A person suffering from Vitamin B12 deficiency suffers from loss of appetite and retarded growth.
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