Stability of Carbanion

Q.

What is bent rule? Please explain

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

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

Q.

The correct order of acid character of the following compounds is:

1. II>III>IV>I

2. III>II>I>IV

3. IV>III>II>I

4. I>II>III>IV

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

1. 
2. 
3. 
4. 

Q.

Assertion: ${\mathrm{HNO}}_3$ is a stronger acid than ${\mathrm{HNO}}_2$.

Reason: In ${\mathrm{HNO}}_3$ there is two nitrogen to oxygen bonds whereas in ${\mathrm{HNO}}_2$ there is only one.

1. Both Assertion and Reason are false.

2. Assertion is true, but Reason is false.

3. Both Assertion and Reason are true. The reason is the correct explanation of Assertion.

4. Both Assertion and Reason are true. The reason is not the correct explanation of Assertion.

Q.

Which of the following species can act as the strongest base?
(a) ${}^{\Theta }OH$
(b) ${}^{\Theta }OR$
(c) ${}^{\Theta }O{C}_6{H}_5$
(d)

Q.

How many resonance structures does ${{\mathrm{N}}_3}^{-}$ have?

Q.

$O{H}^{-}$ is more basic than $S{H}^{-}$ because

1. none of the three

2. Oxygen is smaller than sulphur
   

3. Oxygen is more electronegative than sulphur
   

4. O and S are different hybridised
   

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

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

Q. Order of decreasing basic strengths of halides is :

1. $F^{-}>C{l}^{-}>I^{-}>B{r}^{-}$
2. $F^{-}>C{l}^{-}>B{r}^{-}>I^{-}$
3. $I^{-}>B{r}^{-}>C{l}^{-}>F^{-}$
4. $I^{-}>C{l}^{-}>B{r}^{-}>F^{-}$

Q. The correct order of increasing basicity of the given conjugated bases is:

1. $RCO{O}^{-}<HC\equiv C^{-}<R^{-}<N{H}_2^{-}$
2. $R^{-}<HC\equiv C^{-}<RCO{O}^{-}<N{H}_2^{-}$
3. $RCO{O}^{-}<HC\equiv C^{-}<N{H}_2^{-}<R^{-}$
4. $RCO{O}^{-}<N{H}_2^{-}<HC\equiv C^{-}<R^{-}$

Q. Arrange the following in correct order of acidic strength:
$\left(I\right)C{H}_3-N{O}_2\left(II\right)N{O}_2-C{H}_2-N{O}_2\left(III\right)C{H}_3-C{H}_2-N{O}_2\left(IV\right)N{O}_2-\underset{\underset{N{O}_2}{|}}{CH}-N{O}_2$

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

Q. Consider the following carbanions.


Correct decreasing order of stability is:

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

Q.

Which is the strongest conjugate base? The options are, (CH3)3CO , (CH3)2CHO , CH3CH2O, CH3O

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

1. 
2. 
3. 
4. 

Q.

Is sulfuric acid a nucleophile or electrophile?

Q. Which of the following carbanions are not resonance stabilized?

1. 
2. 
3. 
4. 

Q. Which of the following alcohols is expected to have a lowest $p{K}_a$ value?

1. Ethanol
2. 1-Propanol
3. 2-chloroethanol
4. 2, 2, 2-trifluoroethanol

Q. Which of the following carbanion is most stable?

1. Primary
2. Secondary
3. Tertiary
4. Methyl

Q. Choose the correct statement regarding the given compounds :

1. $I$ is more acidic than $II$
2. $I$ is less acidic than $II$
3. $III$ is less acidic than $IV$
4. $III$ is more acidic than $IV$

Q. Choose the correct order of acidic strength for the following compounds:

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

Q. Increasing order of acidic strength of given compounds is:

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

Q. Rank the following in decreasing order of basic strength is:

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

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

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

Q.

H₃PO₃ can be represented by structures 1 and 2 shown below. Can these two structures be taken as the canonical forms of the resonance hybrid representing H₃PO₃? If not, give reasons for the same.

Q. Which of the following is not an electron-deficient intermediate?

1. Carbocation
2. Carbanion
3. None of these
4. Free radical

Q. Rank the following compounds in order of decreasing acidic strength :

1. $3>2>4>1$
2. $4>1>3>2$
3. $3>1>4>2$
4. $1>2>3>4$

Q. Some pairs of acids are given below. Select the pair in which second acid is stronger than first.

1. $C{H}_{2}ClCOOHandC{H}_{2}BrCOOH$
2. $C{H}_{3}C{H}_{2}CHFCOOHandC{H}_{3}CHFC{H}_{2}COOH$
3. $CH{F}_{2}COOHandC{H}_{2}ClCOOH$
4. $C{H}_{3}COOHandC{H}_{2}FCOOH$

Q. The correct IUPAC name of the following structure is :

1. 1, 3-dimethyl benzenol
2. 2, 6-dimethyl benzenol
3. 1-hydroxy-2, 6-dimethyl benzene
4. 1-hydroxy-1, 3-dimethyl benzene