Name the given compound according to the iupac nomenclature

there are two ways to write the name of the compound and the two ways are generally acceptable

4—Ethly—2,5—hept—diene

Or

4—Ethlyhept—2,5—diene

Explanation:

specific gravity is the density of a substance divided by the density of water. since (at standard temperature and pressure) water has a density of 1 gram/cm3, and since all of the units cancel, specific gravity is usually very close to the same value as density

so "c" is the answer

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