MCAT Exam > MCAT Questions > Which of the following is the weakest base?a)...
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Which of the following is the weakest base?
- a)CH3
- b)H-F
- c)H-Cl
- d)H-Br
- e)H-I
Correct answer is option 'E'. Can you explain this answer?
Most Upvoted Answer
Which of the following is the weakest base?a)CH3b)H-Fc)H-Cld)H-Bre)H-I...
The electronegativity and atomic size of iodine is larger so there is a weaker bond between hydrogen and iodine that makes the electron cloud much lesser than H-F bond. So, H-I is the weakest base; in other words it is the strongest acid.
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Community Answer
Which of the following is the weakest base?a)CH3b)H-Fc)H-Cld)H-Bre)H-I...
Explanation:
Definition of a Weak Base:
A weak base is a substance that does not fully ionize in solution and therefore does not readily accept protons.
Comparison of Bases:
To determine the weakest base among the given options, we need to consider the strength of the conjugate acids of the bases. The weaker the conjugate acid, the stronger the base.
Analysis of Options:
a) CH3: The conjugate acid of CH3 is CH4 (methane), which is a weak acid. Therefore, CH3 is a relatively weak base.
b) H-F: The conjugate acid of H-F is HF (hydrofluoric acid), which is a weak acid. H-F is a relatively weak base.
c) H-Cl: The conjugate acid of H-Cl is HCl (hydrochloric acid), which is a strong acid. H-Cl is a stronger base compared to CH3 and H-F.
d) H-Br: The conjugate acid of H-Br is HBr (hydrobromic acid), which is a strong acid. H-Br is a stronger base compared to H-Cl, CH3, and H-F.
e) H-I: The conjugate acid of H-I is HI (hydroiodic acid), which is a strong acid. H-I is the strongest base among the given options.
Therefore, the weakest base among the options provided is H-I.
Definition of a Weak Base:
A weak base is a substance that does not fully ionize in solution and therefore does not readily accept protons.
Comparison of Bases:
To determine the weakest base among the given options, we need to consider the strength of the conjugate acids of the bases. The weaker the conjugate acid, the stronger the base.
Analysis of Options:
a) CH3: The conjugate acid of CH3 is CH4 (methane), which is a weak acid. Therefore, CH3 is a relatively weak base.
b) H-F: The conjugate acid of H-F is HF (hydrofluoric acid), which is a weak acid. H-F is a relatively weak base.
c) H-Cl: The conjugate acid of H-Cl is HCl (hydrochloric acid), which is a strong acid. H-Cl is a stronger base compared to CH3 and H-F.
d) H-Br: The conjugate acid of H-Br is HBr (hydrobromic acid), which is a strong acid. H-Br is a stronger base compared to H-Cl, CH3, and H-F.
e) H-I: The conjugate acid of H-I is HI (hydroiodic acid), which is a strong acid. H-I is the strongest base among the given options.
Therefore, the weakest base among the options provided is H-I.
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