Chemistry
Neoprene is prepared by polymerisation of which of the following

2-chloro-1, 3-butadiene
1,3-butadiene
Acrylonitrile
2-methyl 1, 3-butadiene

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Chemistry
The open "Sigrees" or coal stoves often require fanning to sustain burning because of

Interrupted release of moisture from the material
Tendency of carbon dioxide to form a layer along with dust smoke
Accumulation of smoke and dust over the sigrees
Lack of oxygen in the surroundings of sigrees

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