Question

Amongst the given set of reactants, the most appropriate for preparing $2^{\circ }$ amine is______.

• A. $2^{\circ }R-Br+NaCN$
  followed by $H_2/Pt$
• B. $1^{\circ }R-N{H}_2+RCHO$
  followed by $H_2/Pt$
• C. $2^{\circ }R-Br+N{H}_3$
• D. $1^{\circ }R-Br\left(2mol\right)+$ potassium phthalimide followed by $H_3{O}^{+}$/heat

Answer 1

The correct option is B $1^{\circ }R-N{H}_2+RCHO$

followed by $H_2/Pt$
Analyzing the options

Option (A):


$1^{\circ }$amine is formed as a final product, so not a correct option.

Option (B):

$1^{\circ }$amine is formed as a final product, so not a correct option.

Option (C):
$1^{\circ }$ amine reacts with aldehyde to form imine and reduction of imine in presence of$H2/Pt$ gives secondary amine.



$2^{\circ }$ amine is formed as a final product.

Option (D):

$1^{\circ }R-Br\left(2mol\right)+$ potassium phthalimide followed by $H_3{O}^{+}$∕heat




$1^{\circ }$ amine is formed as a final product, so not a correct option.
Hence, the correct answer is option (C).