Stability of Carbanion

Q. Which of the following phenols has the largest $p{K}_a$ value (i.e., least acidic)?

1. 
2. 
3. 
4. 

Q. The sequence for the stability of carbanions $H-C\equiv C^{-},H_{2}C=\stackrel{-}{C}H$ and ${}^{-}C{H}_3$ is:

1. ${}^{-}C{H}_3>H-C\equiv C^{-}>H_{2}C=\stackrel{-}{C}H$
2. $H-C\equiv C^{-}>H_{2}C=\stackrel{-}{C}H{>}^{-}C{H}_3$
3. $H_{2}C=\stackrel{-}{C}H>H-C\equiv C^{-}{>}^{-}C{H}_3$
4. ${}^{-}C{H}_3>H_{2}C=\stackrel{-}{C}H>H-C\equiv C^{-}$

Q. Which of the following compounds has the highest value of $p{K}_a$?

1. $I$
2. $II$
3. $III$
4. $IV$

Q. Arrange the following carbanions in decreasing order of stability.

1. $IV>III>I>II$
2. $III>IV>II>I$
3. $I>III>II>IV$
4. $II>I>III>IV$

Q. Arrange the following compounds in an increasing order of their acidic strengths.

1. $III<I<IV<II$
2. $II<I<IV<III$
3. $I<III<IV<II$
4. $II<III<I<IV$

Q. The most acidic compound out of the following is :

1. A
2. B
3. C
4. D

Q. Carbanion formation in the presence of a strong base is the easiest in -

1. $C{H}_4$
2. $C{H}_3-C{H}_3$
3. $C{H}_3-CN$
4. $CH(CN{)}_3$

Q. Which of the following is the strongest Bronsted acid?

1. 
2. 
3. 
4. 

Q. Arrange the following carbanions in decreasing order of stability.

1. $IV>III>I>II$
2. $III>IV>II>I$
3. $I>III>II>IV$
4. $II>I>III>IV$

Q. Which of the following carbanions is the most stable?

1. 
2. 
3. 
4. 

Q. The decreasing order of acidity of the following compounds is:

1. I > II > III
2. II > I > III
3. III > II > I
4. I > III > II

Q.

Is there any charge present in the atmosphere?

Q. The correct stability order of the anions formed due to the deprotonation of the following molecules is:

1. III > IV > II > I
2. IV > III > I > II
3. III > II > I > IV
4. II > III > IV > I

Q. How acidic strength of an acid is related to its conjugate base?

1. Weaker the conjugate base means stronger the acid
2. Stronger the conjugate base means stronger the acid
3. Weaker the conjugate base means weaker the acid
4. None of the above

Q.

The stability of carbanions in the following

i) $RC\equiv \stackrel{\ominus }{C}$

ii)

iii) $R_{2}C=\stackrel{\ominus }{CH}$

iv) $R_{3}C-\stackrel{\ominus }{C{H}_2}$

is in the order of

1. (i) > (ii) > (iii) > (iv)

2. (ii) > (iii) > (iv) > (i)

3. (iv) > (ii) > (iii) > (i)

4. (i) > (iii) > (ii) > (iv)

Q. Which one of the following carbocations are most stable ?

1. 
2. 
3. 
4. 

Q. Arrange the marked hydrogens (a, b and c) in increasing order of their acidic strength :

1. (c) > (b) > (a)
2. (a) > (b) > (c)
3. (b) > (a) > (c)
4. (a) > (c) > (b)

Q. What is the characteristic of a strong acid?

1. Has weaker conjugate base
2. Releases $H^{+}$ easily
3. Has a stable conjugate base
4. All of the above

Q. What is the correct increasing order of extent of deprotonation for the following acids in their aqueous solutions?
$\left(I\right)\left(C{H}_3{)}_{2}CHCOOH\right(II\left)C{H}_{3}C{H}_{2}COOH\right(III\left)C{l}_{2}CHC{H}_{2}COOH\right(IV)C{H}_{3}CC{l}_{2}COOH$

1. II < I < III < IV
2. IV < III < I < II
3. I < II < III < IV
4. I < IV < III < II

Q. Rank in the order of increasing acidity :

1. $III<II<I$
2. $III<I<II$
3. $I<II<III$
4. $II<I<III$

Q. Which of the following compounds has the highest value of $p{K}_a$?

1. $I$
2. $II$
3. $III$
4. $IV$

Q. ​​​​​​The decreasing order of $p{K}_a$ value of the following is:
I. $CH\equiv CH$
II.
III.

1. $III>I>II$
2. $II>I>III$
3. $III>II>I$
4. $I>II\equiv III$