Question

Which of the following has a chiral carbon?

• A. 4-chlorobutan-1-ol
• B. $3^{\circ }$-Butyl alcohol
• C. sec-butylamine
• D. butan-1-ol

Answer 1

The correct option is C sec-butylamine

Compound having asymmetric carbon/chiral carbon will show optical activity.
Carbon which has four different substitutent attached to it is called asymmetric carbon or chiral carbon. Compound having chiral carbon will rotate the plane polarised light clockwise or anti-clockwise unless it has any plane or centre of symmetry.
Compound (a), (b) and (d) lacks chiral carbon so they don't show optical activity.
Compound (c) has a asymmetric chiral carbon. Thus, it is a optically active compound.