Structural isomers are chemical compounds that have
a)the same atoms that are arranged in different orders.
b)the same atoms that are arranged in the same order.
c) the same types of bonds that are bonding the same number of carbon atoms to different atoms.
d) different types of bonds that are bonding the same number of carbon atoms to different atoms.

A) the same atoms that are arranged in different orders.

Explanation: Structural isomers are those chemical compounds which have same molecular formula but different bonding patterns.  

These isomers are also called as constitutional isomers.

Eample: Butane and isobutane have same molecular formula i.e. but the arrangement of atoms differ as shown below.

hurricanes form when warm, moist air from the ocean surface quickly rises into the atmosphere and forms storm clouds and rain. when the clouds are formed, heat is released which warms the cool air in the upper regions of the atmosphere so that the cycle can continue. which two phases of the water cycle are repeated in this process?