Chemistry
The compound that has the least value for octane number is :

Iso-octane
2-methyl heptane
2,2-dimethyl hexane
N-heptane

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Chemistry
Water cycle refers to

An integrated attempt to recycle water in relatively arid regions
Scientific management of water in areas excessively plagued with water-logging
Constant movement of water from ocean to land and back to ocean once again
Water distribution in relatively dry areas

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