Consider the following organic compound,
\begin{array}{ccccccc} 1 & 2 & 3 & 4 & 5 & 6 & 7 \\ CH _3 & – CH _2 & – CH _2 & – CH _2 & – CH _2 & – CH _2 & – CH _3 \end{array}To make it a chiral compound, the attack should be on carbon
(a) 1
(b) 4
(c) 3
(d) 6
(c) 3