Carbon atom b

Carbon atom a

Carbon atom c

Br^- is a poor nucleophile as it is a strong base with a strong conjugate acid.

Br^- is a good nucleophile as it is a weak base with a strong conjugate acid.

Br^- is a good nucleophile as it is a strong base with a weak conjugate acid.

Br^- is a poor nucleophile as it is a weak base with a strong conjugate acid.

4

3

0

1

2

The order from best leaving group to worst leaving group is b, a, d, c.

The order from best leaving group to worst leaving group is c, d, a, b.

The order from best leaving group to worst leaving group is b, d, c, a.

The order from best leaving group to worst leaving group is d, b, a, c.

EtO^- is a good nucleophile as it is a weak base with a strong conjugate acid.

EtO^- is a poor nucleophile as it is a weak base with a strong conjugate acid.

EtO^- is a poor nucleophile as it is a strong base with a strong conjugate acid.

EtO^- is a good nucleophile as it is a strong base with a weak conjugate acid.

MeO^- is a good leaving group as it is a weak base with a strong conjugate acid.

MeO^- is a bad leaving group as it is a strong base with a strong conjugate acid.

MeO^- is a bad leaving group as it is a strong base with a weak conjugate acid.

MeO^- is a good leaving group as it is a strong base with a strong conjugate acid.

diastereomers

constitutional (structural) isomers

unrelated

enantiomers

the same compound