Some statements are given below about diethyl ether,
1. its boiling point lower than 1-butanol
2. it is used as anaesthetic
3. with dilute `H_2SO_4`, it give two homologue
4. with cold HI give iodoethane
Among the above, correct statement(s) is/are
A. only 1
B. only 1 and 2
C. only 2
D. only 1, 2 and 4
