Oxidation of a 2° alcohol with chromic acid results in the production of ________.

A) an ester
B) a ketone
C) an aldehyde
D) an ether
E) none of the above

Which of the following reagents can be used to convert cyclopentanol to cyclopentane?

A) TsCl, pyridine followed by LiAlH₄
B) Na₂Cr₂O₇, H₂SO₄
C) NaBH₄ followed by H₃O⁺
D) H₂SO₄, heat followed by H₂, Pt
E) both A and D

When L-erythrose is treated with NaBH₄, ________.

A) a 70:30 mixture of enantiomeric alditols results
B) a 50:50 mixture of enantiomeric alditols results
C) a meso alditol is produced
D) the product mixture contains two diastereomeric alditols
E) an optically active alditol is produced