What is the best name for the molecule below? (2 points)

a compound with a total of nine carbons with a double bond and the rest single bonds. there is a straight chain of six carbons along the bottom with a double bond between the fifth and sixth carbons when counting from left to right. there is a propyl group branching off of the third carbon from the left.

4-ethyl-6-heptene
4-propyl-1-hexene
4-ethyl-1-heptene
3-propyl-5-hexene

4-ethyl-1-heptene

Explanation: The IUPAC nomenclature follows following rules

1. The longest carbon chain is chosen which must include the functional groups, double and triple bonds.

2. The numbering of the chain starts from the end such that the functional group or the double or triple bond gets the lowest number.

3. The carbons which do not get any number are called as substituents.

The name starts with the number of the carbon bearing the substituent, followed by the name of the substituent. Thus 4-propyl. Then the word root is written which is the number of carbons in the longest chain. Thus it is hept. Then the suffix is the number and name of the functional group or double and triple bond. Thus 1-ene.

The name is 4-ethyl-1-heptene.

atomic mass = 39

number of neutrons = 20

number of protons= 19

electronic configuration = 1s2 2s2 2p6 3s2 3p6 4s1

the number of electron in first shell = 2

number of electrons in n=3 shell = 8

c is having 4 valence electrons and is bonded to three hydrogens and one sulphur atom, therefore, the number of bond pair is equal to four. as all the valence electrons are used in forming the bonds so, there is no lone pair left on carbon.

s is having 6 valence electrons and is bonded to one other sulfur atom and one carbon atom, therefore, the number of bond pair is equal to 2. as only two valence electrons are used in forming the bonds so, four electrons are left. therefore, two lone pairs are present on s.