Question

53. (A)

    and (B)

True statement for the above compounds is

• A. (A) is phenol while (B) is alcohol
• B. Both (1) and (2) are primary alcohol
• C. (A) is primary and (2) is secondary alcohol
• D. (A) is secondary and (2) is primary alcohol

Answer 1

Answer: (D)

4

Answer 2

• Analyze Compound (A):

  • Compound (A) is cyclohexanol.
  • The hydroxyl (-OH) group is directly attached to a carbon atom of the cyclohexane ring.
  • This carbon atom is bonded to two other carbon atoms within the ring.
  • Therefore, the carbon bearing the -OH group is a secondary carbon.
  • Hence, compound (A) is a secondary alcohol.
  • It is not a phenol because the -OH group is attached to a saturated alicyclic ring, not an aromatic benzene ring.

• Analyze Compound (B):

  • Compound (B) is 2-cyclohexylethanol.
  • The hydroxyl (-OH) group is attached to the terminal carbon of the -CH₂CH₂OH chain.
  • This terminal carbon (-CH₂OH) is bonded to only one other carbon atom (the -CH₂- group attached to the cyclohexane ring).
  • Therefore, the carbon bearing the -OH group is a primary carbon.
  • Hence, compound (B) is a primary alcohol.

• Evaluate the options:

  • (1) (A) is phenol while (B) is alcohol: False, (A) is an alcohol, not a phenol.
  • (2) Both (1) and (2) are primary alcohol: False, (A) is secondary.
  • (3) (A) is primary and (2) is secondary alcohol: False, (A) is secondary and (B) is primary.
  • (4) (A) is secondary and (2) is primary alcohol: True, based on our analysis.