Which of the following terms best describes the pair of compounds shown?  

Which of the following molecules could NOT act as a Lewis base?

Among the hexane conformers, which occur at energy minima on a graph of potential energy versus dihedral angle?  

Many of the original, professional organizations for career counselors have___________.

Which of the following reacts fastest with methanol by the SN1 mechanism?  

Which of the following compounds will not produce a syn-diol when treated with OsO4 followed by hydrolysis with aqueous NaHSO3?  I.  (E)-4-hexeneII.  cis-3,4-dimethyl-3-hexeneIII. (Z)-4-hexeneIV. trans-3,4-dimethyl-3-hexene

What is a the preeminent concern regarding the use of computers in career counseling?

A chemist has a compound, C4H9Cl, which he believes to be either n-butyl chloride or t-butyl chloride. He reacts the compound with potassium t-butoxide and gets an alkene, C4H8. He determines that the rate of reaction decreases when the concentration of potassium t-butoxide decreases. Therefore, the original compound was:  

Which of the following is the best leaving group?    

Consider the bond dissociation energies listed below in kcal/mol.   CH3-Br             70 CH3CH2-Br     68 (CH3)2CH-Br  68 (CH3)3C-Br     65   These data show that the carbon-bromine bond is weakest when bromine is bound to a ________.