Select the appropriate synthetic route to convert methylcyclobutane into cyclopentene.

◦ 1. BH
3-THF; 2. H
2O
2, NaOH; 3. H
2, Pt
◦ 1. H
2, Lindlar's catalyst; 2. BH
3-THF; 3. H
2O
2, NaOH
◦ 1. KO
tBu; 2. BH3-THF; 3. H
2O
2, NaOH; 4: H
2SO
4, heat
◦ 1. Br
2,
hv; 2. KO
tBu; 3. H
2O
2, NaOH; 4: H
2SO
4, heat
◦ 1. Br
2,
hv; 2. KO
tBu; 3. BH
3-THF; 4. H
2O
2, NaOH; 5: H
2SO
4, heat