19. Addition of Br2 to ( E )-hex-3-ene produces_________. (A) A meso dibromide. (B) A mixture of enantiomeric dibromides which is optically active. (C) A mixture of enantiomeric dibromides which is optically inactive. (D) (Z)-3,4-dibromo-3-hexene. (E) ( E )-3,4-dibromo-3-hexene.

9. Which description about the frontier molecular orbital theory is False? (A) HOMO is an acronym for highest occupied molecular orbital. (B) Antibonding molecular orbitals are higher in energy than the isolated atomic orbitals from which they made. (C) The LUMO of 1,3-butadiene has one node. (D) The HOMO of allyl anion has one node. (E) The thermal [2+2] cycloaddition of two ethylenes to give cylobutane is a symmetry-forbidden reaction.

19. Addition of Br₂ to ( E )-hex-3-ene produces_________.
(A) A meso dibromide.
(B) A mixture of enantiomeric dibromides which is optically active.
(C) A mixture of enantiomeric dibromides which is optically inactive.
(D) (Z)-3,4-dibromo-3-hexene.
(E) ( E )-3,4-dibromo-3-hexene.

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