Which of these alkyl halides cannot be used to prepare amines using gabriel synthesis? a.1-bromopentane b.1-bromo-3-methylbutane c.2-bromo-3-methylpentane d.1-bromo-2,3-dimethylbutane e.2-bromo-2,3-dimethylbutane?

For Gabriel synthesis halides  should be primary.
a.1-bromopentane -primary
b.1-bromo-3-methylbutane -pimary
c.2-bromo-3-methylpentane -secondary - cannot be used
d.1-bromo-2,3-dimethylbutane -primary 
e.2-bromo-2,3-dimethylbutane- tertiary -cannot be used    
I think it should be like this

The answer is 65.3312