1.

One entire branch of chemistry is devoted to the behaviour of the compounds of just one element carbon because (i) there are many more compounds that contain carbon than there are compounds that do not. (ii) the molecuels containing carbon can be so simple, so the much larger, and more complex. (iii) organic compounds have been divided into families which generally have no counterparts among the inorganic compounds. (iv) the arrangement of atoms in even relatively small molecules can be very complicated.A. (1) (i), (ii), (iii), (iv)B. (2) (i), (ii)C. (3) (i), (ii), (iii)D. (4) (i), (iii), (iv)

Answer» Correct Answer - A
(a) More than `19` million natural and synthetic organic compounds have been indentified so far and thousands of new ones are made each week in chemical laboratories throughout the world. This number is significantly gretare than the `10, 000` or so inorganic compounds known to exist.
(b) A methane molecule while `DNA` contains tens of billions of atoms per molecule.


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