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A-6 When soap is added to an oily or greasy part of cloth, the hydrocarbon part of soap dissolves in oil, keeping the head away from the oil. Big molecules of oil and soap break by rubbing into small emulsified oil droplets in water, which are washed away by stream of water.
A-7 1. Ethene is a saturated hydrocarbon. From its name it is clear that ethene has two carbon atoms. Each carbon is sp2 hybridized and the molecular structure isCH2=CH2 . Here, carbon has a 4 valence electron.
2. The structural formula of propane is . As valence electrons are used to draw the electron dot structure, the number of valence electrons of propane must be identified. Accordingly, propane has 20 valence electrons. As Carbon atom is present in less, it is determined as the center atom.
Explanation:
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