NEET Sample Paper NEET Sample Test Paper-82

Number of \[{{H}^{+}}\] delivered by an acid in its aqueous solution is called basicity or protocity of the acid. The acids are referred to as monobasic, dibasic, tribasic etc., according as the number of protons given in aqueous solution are one, two or three. Which of the following is most acidic in nature?

A) \[C{{H}_{2}}{{F}_{2}}\]

B) \[{{C}_{2}}{{H}_{2}}\]

C) \[{{C}_{2}}{{H}_{4}}\]

D) \[{{H}_{2}}O\]

Correct Answer: B

Solution :

Greater the electronegativity of central atom greater its acidic strength

Hybridisation of central atom
\[{{\operatorname{CH}}_{2}}{{F}_{2}}\]	\[s{{p}^{2}}\]
\[{{\operatorname{C}}_{2}}{{H}_{2}}\]	sp
\[{{\operatorname{C}}_{2}}{{H}_{4}}\]	\[s{{p}^{2}}\]
\[{{H}_{2}}O\]	\[s{{p}^{3}}\]

In \[{{C}_{2}}{{H}_{2}}\] hybridisation of carbon is sp, hence more s character hence more electronegativity.