Q. Compounds in which one carbon atom is common to two different rings are known as "spiro" compounds. The name for a spiro compounds begins with the word spiro followed by the square brackets containing the number of carbon atoms, in ascending order, in each ring connected to the common carbon atom and then by the name of the parent hydrocarbon corresponding to the total number of -atoms in the rings. The positions of substituents are indicated by numbers, the numbering beginning with the carbon atom adjacent to the common carbon and proceeding first around the smaller ring and then around the larger ring and finally ending on the common carbon atom
The IUPAC name of compound Chemistry Question Image

 133  159 Organic Chemistry – Some Basic Principles and Techniques Report Error

Solution:

Correct answer is (a) spiro (2,4) heptane