The boiling points of the hydrides of group 16 elements is as follows:\\\\(H_2O\\\\) \\\\(\\rightarrow\\\\) \\\\(100^{\\circ}C\\\\)\\\\(H_2S\\\\) \\\\(\\rightarrow\\\\) \\\\(- (60^{\\circ }C)\\\\)\\\\(H_2Se\\\\) \\\\(\\rightarrow\\\\) \\\\(-(41.25^{\\circ}C)\\\\)\\\\(H_2Te\\\\) \\\\(\\rightarrow\\\\) \\\\(-(2.2^{\\circ}C)\\\\)Gradual increase in boiling points down the rest of the group happens as the relative molecular mass of the molecules increases.Also, boiling point of water is \\\\(\ extbf{anomalously}\\\\) high.Hence \\\\(H_2S\\\\) has lowest boiling point here.