What is the best reagent to convert nitrile to primary amine?

The most appropriate reagent for the conversion of $C_2H_5CN$ into $CH_3CH_2CH_2NH_2$ is:

Gabriel phthalimide synthesis is used in the preparation of primary amines from phthalimide. Which of the following reagents is not used during the process?

Identify the major organic product formed from the following reaction sequence:
$CH_3-CH(CH_3)-CO-CH_3 \xrightarrow[(ii) LiAlH_4, (iii) H_2O]{(i) CH_3NH_2} \text{?}$

Predict the major product $P$ in the following sequence of reactions$-$
$(i)$ $HBr$,benzoyl peroxide
(ii) $KCN$
(iii) $Na(Hg)/C_2H_5OH$
[Image: $1-$methylcyclopentene reacting with the above reagents to form $P$]

The major product of the following reaction is: