The number of structural isomers possible for the molecule C3H9N is

[Step 1]:The possible structural isomers of C3H9N are1) CH3−CH2−CH2−NH2 (1° amine)2) CH3−C|NH2H−CH3 (1°amine)3) CH3−NH−CH2−CH3 (2° amine)4) CH3−N|CH3−CH3 (3° amine)