Question

Arrange the following amines in order of increasing basicity n - pentylamine (I), Sec-pentyl amine (II), iso - pentylamine (III), tert - pentylamine (IV). 

(A) I < II < III < IV 

(B) II < III < I < IV 

(C) IV < III < II < I 

(D) III < IV < I < II

Answer 1

(C) IV < III < II < I 

As the steric hindrance increases from (I) + (IV)the basicity decreases, so, increasing order of basicity becomes IV < III < II < I.