Which of the following are correct chain isomers of butane ?
(i)

Options

A. (i) gt (ii) gt (iii) gt (iv)
B. (ii) gt (i) gt (iii) gt (iv)
C. (iv) gt (iii) gt (ii) gt (i)
D. (iii) gt (iv) gt (ii) gt (i)

Answer

C

Explanation

Nucleophile will preferentially attack the compound which has lower electron density. Out of the given options, (iv) has four electron withdrawing groups and is the most preferred substrate. So, the order is (iv)>(iii)>(ii)>(i).