\(a.\)
\(CH_3-CH_2-CH_2-CH_2-CH_3\)
\(CH_3-CH\left(CH_3\right)-CH_2-CH_3\)
\(b.\)
\(CH_3-CH\left(CH_3\right)-CH_3\)
\(CH_3-\left(CH_3\right)C\left(CH_3\right)-CH_2-CH_3\)
\(c.\)
\(CH_3-CH\left(CH_3\right)-CH_2-CH_3\)
\(d.\)
\(\left(CH_3\right)_4C\)
\(e.\)
\(C-C-C\left(C_2H_5\right)-CH_2-CH_3\)
\(f.\)
\(CH_3-CH\left(CH_3\right)-CH\left(CH_3\right)-CH_2-CH_3\)