question_answer

Select correct statement -

A) Acidic strength of \[HBr>HCl\] but reverse is true for their reducing property

B) Basic strength of \[P{{H}_{3}}>As{{H}_{3}}\] but reverse is true for their Bond angle

C) Dipole moment of \[C{{H}_{3}}Cl>C{{H}_{3}}F\] but reverse is true for their HCH bond angle

D) \[{{K}_{{{a}_{1}}}}\]of fumaric acid is higher than maleic acid but reverse is true for their \[{{K}_{{{a}_{2}}}}\]

Correct Answer: C

Solution :

[a] Acidic strength of HBr > HCl and their reducing properties are also in same order

[b] Basic strength of \[P{{H}_{3}}>As{{H}_{3}},\]their bond angles are also in same order \[{{\theta }_{2}}>{{\theta }_{1}}\] because \[C-H\] bond has more s-character in \[C{{H}_{3}}F\]than in \[C{{H}_{3}}Cl\]

[D] \[{{K}_{{{a}_{1}}}}\]of maleic acid is higher then \[{{K}_{{{a}_{1}}}}\]of fumaric acid but reverse is true for their \[{{K}_{{{a}_{2}}}}\]

[C]