State whether the following statements are true or false.
a. In benzene, carbon uses all the three p obitals for hybridisation.
b. Ácetylene is a tetrahedral molecule.
c. Branched chain alkanes, alkenes and aromatic hydrocarbons have high octane numbers.
d. Ethyne can be distinguished from ethene by using cold dilute `KMnO_4^-`
e. In cracking, the larger molecule are broken down into smaller molecules and in reforming, cyclic and acyclic alkanes are converted into arenes.

Explanation

True :- .c,e. .. False : .a, b, d.