Question

Consider the following alkane and answer the following questions.
${\left({CH}_3\right)}_{2}CH{CH}_{2}CH\left(C_2{H}_5\right)CH\left({CH}_3\right){CH}_3$
(a) Write the complete structural formula of the alkane.
(b) What is its molecular formula?
(c) Write its bond line formula and give IUPAC name.
(d) How many methyl, methylene and methine groups are present in this alkane?
(e) How many ethyl and isopropyl groups are present in this alkane?
(f) How many carbon atoms are $1^o,2^o,3^o,4^o$?

Answer 1

(a) $C{H}_3-\underset{C{H}_3}{\underset{|}{CH}}-C{H}_2-\stackrel{C_2{H}_5}{\stackrel{|}{CH}}-\underset{C{H}_3}{\underset{|}{CH}}-C{H}_3$

(b) Molecular formula $=C_{20}{H}_{22}$

(c) ( Refer image ) IUPAC name $\equiv 3-ethyl-2,5-dimethylhexane$

(d) methyl $=5$, methylene $=2$, methine $=2(-C{H}_2)$

(e) Ethyl $=1$, Iso-propyl $=2$

(f) $1^o-$ carbon $=5,2^o-$ carbon $=2,3^o-$ carbon $=3,4^o-$ carbon $=0$