What causes the difference in melting/boiling points between these five sets of

Question

What causes the difference in melting/boiling points between these five sets of compounds? Explain in detail please

Match each pair of compounds on the left and its corresponding melting points (m, p.) or boiling points (b, p.) in degree C to a major reason, given on the right, why the physical property increases. Answers may be repeated. 1. CH_3CH_2PHCH_3 (m, p. -160), CH_3P(CH_3)_2 (m. p. -85) _____ a. more hydrogen bonds 2. CH_3N(CH_3)_2 (m, p. -117), CH_3P(CH_3)_2 (m, p. -85) _____ b. more polar bonds 3. CH_3CH_2NHCH_3 (b, p. 36), CH_3(CH_2)_2NH_2 (b, p. 48) _____ c. more rotational symmetry 4. (CH_3)_2CHNH_2 (b, p. 33), CH_3CH_2NHCH_3 (b, p. 36) ____ d. more van der Waal interactions 5. CH_3(CH_2)_2NH_2 (b, p. 48), CH_3(CH_2)_2OH (b, p. 97) ____ e. more weight

Explanation / Answer

1.more weight (e)

2.more rotational symetry (c)

3.More weight(e)

4.More polar bonds (b)

5.More hydrogen bonds (a).

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