+I Effect

Q.

The correct order of stability of the following carbanions is:

$(C{H}_3{)}_3{C}^{-}{,}^{-}CC{l}_3,(C{H}_3{)}_{2}C{H}^{-},C_6{H}_5-C{H}_2^{-}$

1. ${}^{-}CC{l}_3>C_6{H}_5-C{H}_2^{-}>(C{H}_3{)}_{2}C{H}^{-}>(C{H}_3{)}_3{C}^{-}$

2. $C_6{H}_5-C{H}_2^{-}{>}^{-}CC{l}_3>(C{H}_3{)}_{2}C{H}^{-}>(C{H}_3{)}_3{C}^{-}$

3. $C_6{H}_5-C{H}_2^{-}{>}^{-}CC{l}_3>(C{H}_3{)}_3{C}^{-}>(C{H}_3{)}_{2}C{H}^{-}$

4. None of the above

Q. The correct order of increasing $+I$ effect is :

1. $-C{H}_3<-H<-D<-T$
2. $-C{H}_3<-H<-T<-D$
3. $-H<-C{H}_3<-T<-D$
4. $-H<-D<-T<-C{H}_3$

Q. Which one of the following is correct ?
I. $C{H}_3-C{H}_2-C{D}_2^{+}$
II. $C{H}_3-C{H}_2-C{T}_2^{+}$
(Explain on the basis of inductive effect)

1. I is more stable than II
2. II is more stable than I
3. Both are equally stable
4. Stability criterion cannot be applied in this case

Q. Which of the following is the correct order of stability for the given carbocations?

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

Q. The correct order of increasing basicity of the given conjugate bases $(R=C{H}_3)$ is

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

Q.

Which of the following order is correct if we consider +I power?

Tertiary-alkyl secondary-Alkyl primary-alkyl

I II III

1. I > II > III

2. I < II < III

3. II > I > III

4. III > II > I

Q. The correct order of $+I$ strength for the following groups
$-C{H}_3,-C{H}_{2}R,-C{D}_3$ is :
(Here $R$ is any alkyl group ).

1. $-C{H}_{2}R>-C{H}_3>-C{D}_3$
2. $-C{H}_3>-C{D}_3>-C{H}_{2}R$
3. $-C{D}_3>-C{H}_{2}R>-C{H}_3$
4. $-C{H}_{2}R>-C{D}_3>C{H}_3$

Q. Which of the following correctly represents the acidic strength of given acids?
1. $C{l}_{3}CH>F_{3}CH$
2.$C{H}_{3}COOH>C{H}_{3}C{H}_{2}OH$
3. $H_{2}O>C{H}_{3}C{H}_{2}OH$
4. $\text{p-nitrophenol}>\text{phenol}$

1. (1) and (2)
2. (1) and (3)
3. (2), (3) and (4)
4. (1), (2), (3) and (4)

Q. Which of the following groups will show the $+I$ effect?

1. $-C{H}_2^{-}$
2. $-N{F}_3^{+}$
3. $-F$
4. Cannot be predicted

Q. Predict which one of the following groups will be most preferred in place of $X$ in the given compound?
$C{H}_3-C{H}_2-\stackrel{+}{C}H-X$

1. $C{R}_3$
2. $N{H}^{-}$
3. $COOH$
4. $N{R}_3^{+}$

Q. Arrange the following in increasing order of $+I$ effect :
$1^{\circ }\text{Alkyl Group,}{2}^{\circ }\text{Alkyl Group,}{3}^{\circ }\text{Alkyl Group}\text{and Methyl Group}$

1. $1^{\circ }\text{Alkyl Group}<2^{\circ }\text{Alkyl Group}<3^{\circ }\text{Alkyl Group}<\text{Methyl Group}$
2. $\text{Methyl Group}<1^{\circ }\text{Alkyl Group}<2^{\circ }\text{Alkyl Group}<3^{\circ }\text{Alkyl Group}$
3. $1^{\circ }\text{Alkyl Group}<3^{\circ }\text{Alkyl Group}<2^{\circ }\text{Alkyl Group}<\text{Methyl Group}$
4. $\text{Methyl Group}<3^{\circ }\text{Alkyl Group}<1^{\circ }\text{Alkyl Group}<1^{\circ }\text{Alkyl Group}$

Q.

Considering the basic strength of amines in aqueous solution, which one has the smallest $p{K}_b$ value ?

1. $(C{H}_3{)}_{3}N$

2. $C_6{H}_{5}N{H}_2$

3. $(C{H}_3{)}_{2}NH$

4. $C{H}_{3}N{H}_2$

Q. Which of the following is not an example of $+I$ group?

1. $-CN$
2. $-N{H}^{-}$
3. $-C{H}_2^{-}$
4. $-C{H}_3$

Q. The correct order of acidic strength is :

1. $C{O}_2>N_2{O}_5>S{O}_3$
2. $C{l}_2{O}_7>S{O}_3>P_4{O}_{10}$
3. $K_{2}O>CaO>MgO$
4. $N{a}_{2}O>MgO>A{l}_2{O}_3$

Q.

Which of the following will show maximum power of +I effect?

1. $N{H}^{-}$

2. $CO{O}^{-}$

3. Tertiary alkyl group.

4. $C{H}_3$