Question

Two organic compounds A and B have the same molecular formula C₆H₁₂. Write the names and structural formulae:

(a) If A is a cyclic compound
(b) If B is an open chain compound

Answer 1

(a) A is likely cyclohexane, a cyclic compound.

Structural formula: H3C−CH2−CH2−CH2−CH2−CH2−CH3

(b) B is likely hexane, an open chain compound.

Structural formula: H3C−CH2−CH2−CH2−CH2−CH3.

(a) If compound A is a cyclic compound with the molecular formula C₆H₁₂, it could be cyclohexane.

Cyclohexane is a saturated hydrocarbon consisting of a ring of six carbon atoms, each bonded to two hydrogen atoms.

Its structural formula is:H3C−CH2−CH2−CH2−CH2−CH2−CH3

The structural formula illustrates the six carbon atoms forming a hexagonal ring, and each carbon atom is saturated with two hydrogen atoms.

(b) If compound B is an open-chain compound with the molecular formula C₆H₁₂, it could be n-hexane.

N-hexane is a straight-chain alkane with six carbon atoms and fourteen hydrogen atoms.

Its structural formula is: H3C−CH2−CH2−CH2−CH2−CH3.

In this structural formula, the six carbon atoms are arranged in a straight chain, and each carbon atom is bonded to two or three hydrogen atoms, satisfying the tetravalency of carbon.

Compound A, a cyclic compound, is likely cyclohexane, and its structural formula is H3C−CH2−CH2−CH2−CH2−CH2−CH3 Compound B, an open-chain compound, is likely n-hexane, and its structural formula is H3C−CH2−CH2−CH2−CH2−CH3.