Write the organic product$($s$)$ of the following substitution reactions. Indicate cis or trans, axial or equatorial, or $R$ or $S$ or racemic, where appropriate. If there is no reaction write NR$.$

a$)$ excess $Na{N}_3$ DMSO solven

b$)$

$KCN$

DMSO solvent

d$)$

e$)$

excess $KCN$

DMSO solvent

f$)$

KCN

DMSO solvent