Question

Number of secondary carbon atoms present in the above compounds are respectively :

• A. 6, 4, 5
• B. 4, 5, 6
• C. 5, 4, 6
• D. 6, 2, 1

Answer 1

The correct option is A 6, 4, 5

Benzene contains 6 secondary carbon atoms.
o-xylene contains 4 secondary carbon atoms, 2 primary carbon atoms and 2 tertiary carbon atoms.
Toluene contains 5 secondary carbon atoms, 1 primary carbon atom and 1 tertiary carbon atom.
A primary carbon atom is attached to only one other carbon atom.
A secondary carbon atom is attached to two other carbon atoms.
A carbon atom is attached to three other carbon atoms
A quaternary carbon atom is attached to four other carbon atoms.