The number of primary, secondary and tertiary carbons in 3,4-dimethylheptane are

Options

A. 4,3 and 2
B. 2,3 and 4
C. 4,2 and 3
D. 3,4 and 2

Answer

A

Explanation

The structure of
3,4-dimethylheptane is given as
`underset(1^(@))overset(1)(C)H_(3)underset(2^(@))overset(2)(C)H_(2)-underset(underset(1^(@))(C)H_(3))underset(|3^(@))overset(3)(C)H-underset(underset(1^(@))(C)H_(3))underset(|3^(@))overset(4)(C)H-underset(2^(@))overset(5)(C)H_(2)_underset(2^(@))overset(6)(C)H_(2)underset(1^(@))overset(7)(C)H_(3)`
Hence, the number of primary, secondary and teritiary carbons present in 3,4-dimethylheptane are 4,3 and 2 respectively.