The branching of alkanes that produces symmetrical structures :
(a) raises the boiling point ; raises the melting point
(b) raises the boiling point ; lowers the melting point
(c) lowers the boiling point ; lowers the melting point
(d) lowers the boiling point ; raises the melting point
(a) raises the boiling point ; raises the melting point
(b) raises the boiling point ; lowers the melting point
(c) lowers the boiling point ; lowers the melting point
(d) lowers the boiling point ; raises the melting point