Chemistry
During fermentation of sugar, the compound which is always formed is :

Ethylene
Ethyl Alcohol
Acetic Acid
Methyl Alcohol

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Chemistry
Water is not effective in extinguishing a fire caused by petrol because

The flame is too hot for water to cool it down
Water and petrol are miscible with each other
Water and petrol are immiscible with each other and petrol which forms the upper layer continues to burn
Water and petrol react chemically

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