Arrange the following solutions in order of their increasing boiling points.
(i) 10–4 M NaCl
(ii) 10–4 M Urea
(iii) 10–3 M NaCl
(iv) 10–2 M NaCl
1
(ii) < (i) < (iii) < (iv)
2
(ii) < (i) ≅ (iii) < (iv)
3
(i) < (ii) < (iii) < (iv)
4
(iv) < (iii) < (i) < (ii)