Question

(a) What is the molecular formula of the compound?
(b) Write its complete structure formula and give IUPAC name.
(c) How many $\sigma$ and $\pi$ bonds are present in its structure?
Molecular formula of the compound:$C_8{H}_{12}$

Answer 1

(a) Molecular formula= $C_8{H}_{12}$

(b) (Refer to Image 1)

Rules for Naming Hydrocarbons:-

Rule-I Selection of the longest carbon chain.

Rule-II Numbering the longest chain: Longest chain is numbered starting from a terminal carbon. Numbering is done is such a way that lowest possible number is given to the side chain or a functional group.

Rule-III Writing names of branched, saturated hydrocarbons, locants are written first in alphabetical order followed by name of parent chain.

Rule-IV Some common names are retained in $IUPAC$ system for unsubstituted hydrocarbon only.

$4-methyl,pent1,3,5-ene$

(c) (Refer to Image 2)

$18-\sigma$ bond

$3-\Pi$ bond