Consider the following species :
(i) (ii) (iii) (iv) (v) (vi) (vii) (viii) (ix)
Then find out total number of species which can act as Lewis acid.

Question

Consider the following species :
(i) $CH_3^+$ (ii) $(CH_3)_3Al$ (iii) $HCHO$ (iv) $CH_4$ (v) $(C_2H_5)_3N$ (vi) $TiCl_4$ (vii) $CO_2$ (viii) $SiCl_4$ (ix) $BF_3$
Then find out total number of species which can act as Lewis acid.

Prashant Kotian · Accepted Answer

Correct answer: 7

**SOLUTION:** $CH_3^+, (CH_3)_3AL, HCHO, TICL_4, CO_2, SICL_4, BF_3$. Step 1: Boiling point of a covalent molecular compound is mainly determined by the strength and extent of intermolecular forces, of which hydrogen bonding is exceptionally strong. Step 2: Water forms an extensive network of 4 hydrogen bonds per molecule; methanol forms an average of 2 hydrogen bonds per molecule; and diethyl ether cannot form intermolecular hydrogen bonds due to the absence of a hydrogen atom bonded to an electronegative atom (N, O, F). Step 3: Thus, the extent of hydrogen bonding decreases from water (highest b.p.) to methanol to diethyl ether (lowest b.p. / absent), which corresponds to option (b).

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