Hydrogen bond is the term given to the relatively weak secondary interaction between a hydrogen atom bound to an electronegative atom and another atom which is also generally electronegative and which

Question

Hydrogen bond is the term given to the relatively weak secondary interaction 
between a hydrogen atom bound to an electronegative atom and another atom which 
is also generally electronegative and which has one or more lone pairs and can 
thus acts as a base. We can give the following generalized representation of a 
hydrogen bond.
X^{\delta-}—H^{\delta+}...Y
Bond dissociation energy of H-bond ranges from 8 to 42 kJ/mol, and the most 
commonly encountered hydrogen bonds are O—H...O, N—H...O and F—H...R

Prashant Kotian · Accepted Answer

Correct answer: D. Step 1: Determine the number of π-bonds in each thionic/sulfur oxyacid species by drawing their Lewis structures to satisfy octets/valencies (S exhibits variable valency up to 6). Step 2: Calculate the π-bonds: (II) H2S2O3 has 2 π-bonds; (III) H2S2O5 has 3 π-bonds; (I) H2S2O6 has 4 π-bonds. Step 3: Order the compounds by increasing number of π-bonds: II (2) < III (3) < I (4), which corresponds to option (c).

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