Ammonolysis of Alkyl halides followed by the treatment with NaOH solution can be used to prepare primary, secondary and tertiary amines. The purpose of NaOH in the reaction is :

The secondary structure of protein is stabilised by:

Fex₂ and Fey₃ are known when x and y are :

Identify the elements X and Y using the ionisation energy values given below :

	Ionization energy (kJ/mol)
	1$${st}$$	2$${nd}$$
X	495	4563
Y	731	1450