Question

In which of the following cyclic chain is the main chain?

• A.

  

• B.

  

• C.

  

• D.

  

Answer 1

The correct option is B

Explanation for correct Answer:

Option (B)

• The cyclic chain will be considered as a parent chain only when it contains more carbon atoms than the attached aliphatic side chain with no functional group on it.
• If the attached aliphatic side chain contains fewer Carbon atoms than the cyclic chain but has a functional group on it then the attached side chain is considered as parent chain.
• In the given option the attached aliphatic side chain and cyclic chain contain a double bond but the cyclic chain Contains more carbon atoms.
• Since the cyclic chain contains more Carbon atoms than the aliphatic side chain, it is considered as the parent chain.
• Hence correct option

Explanation for Incorrect Answer:

Option (A)

• In the given option the attached aliphatic side chain contains a double bond whereas the cyclic ring has contains no double bonds
• So, the attached aliphatic side chain is considered as the parent chain.
• Hence incorrect option

Option (C)

• In the given option the attached aliphatic side chain contains two double bonds whereas the cyclic ring has contains only one double bond
• So, the attached aliphatic side chain is considered as the parent chain.
• Hence incorrect option

Option (D)

• In the given option the attached aliphatic side chain contains a double bond whereas the cyclic ring has contains no double bonds
• So, the attached aliphatic side chain is considered as the parent chain.
• Hence incorrect option

Hence, Option (B) cyclic chain is the main chain.