4 only U) The arrow pointing from c is indicating a carbon atom that is hybridiz

Question

4 only U) The arrow pointing from c is indicating a carbon atom that is hybridized of overiap ow from d is indicating a sigma (o) bond of hat type e) The arrow from e is indicating a What type of sigma bond is that d) The arrow from d is indicating a sigma (a) bond of what type a of overlap e) The arrow from e is indicating a bond from carbon to hydrogen 3) For the equilibrium the two substances which are both acids are: a) H20 and H3o b) CH3NH3 and H20 c) CH3NH3 and CH3NH2 d) CH3NH3 and H3O e) CH3NH2 and H2O 4) A) Which of the following organic compounds is the strongest acid? 4) B) What is the pKa of the following? a) C6H12 pKa = 52 b) CH3CH3 pKa= 50 ) CH3CH2OH pKa =-16 6) Does the reaction procede from left to right as Which is the weakest acid? H20 NaOH CH2CICH2CH2CH2CH2CO2H H3CHBrCH2CH2CH2CO2H H3CH2CH2CBr2CH2CO2H H3CH2CH2CHFCH2CO2H CHN CHAM CH3NH2+ H20

Explanation / Answer

4) A) The compound CF3COOH will be the strongest acid since the value of pKa is the lowest for the same,

pKa = -log[H+], hence the smallest value will be the one with the most H+ ions in the solution, hence the last compound i.e. CF3COOH will be the strongest acid.

B) The strongest acid will be the one with the triple bond compound since the s character is proportional to the acidic strength

Hence the triple bond compound will be present in the sp hybridization leadting to the strongest acid and lowest pka value

Similarly, the order for pKa values is

NH3(Base) > H20(Neutral) > NH4+(Weak Acid) > CH2=CH-CH2-CH3 (stronger acid) > C(triplebond)C-CH2-CH3

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