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**Previous Years AIEEE/JEE Mains Questions**

Q.

**Arrange the carbanions, $\left(\mathrm{CH}_{3}\right)_{3} \overline{\mathrm{C}}, \overline{\mathrm{C}} \mathrm{Cl}_{3},\left(\mathrm{CH}_{3}\right)_{2} \overline{\mathrm{C}} \mathrm{H}, \mathrm{C}_{6} \mathrm{H}_{5} \overline{\mathrm{C}} \mathrm{H}_{2}$ , in order of their****decreasing stability****[AIEEE-2009]**
Q.

**The non aromatic compound among the following is :-****[AIEEE-2011]**
Q.

**ortho-Nitrophenol is less soluble in water than p– and m– Nitrophenols because :-**(1) Melting point of o–Nitrophenol is lower than those of m– and p– isomers (2) o–Nitrophenol is more volatile in steam than those of m– and p– isomers (3) o–Nitrophenol shows Intramolecular H–bonding (4) o–Nitrophenol shows Intermolecular H–bonding**[AIEEE-2012]**
Q.

**Which of the following compounds are antiaromatic :-**(1) (1) and (6) (2) (2) and (5) (3) (1) and (5) (4) (5) and (6)**[AIEEE-2012(Online)]**
Q.

**Among the following the molecule with the lowest dipole moment is :-**(1) $\mathrm{CHCl}_{3}$ (2) $\mathrm{CH}_{2} \mathrm{Cl}_{2}$ (3) $\mathrm{CCl}_{4}$ (4) $\mathrm{CH}_{3} \mathrm{Cl}$**[AIEEE-2012(Online)]**
Q.

**The order of stability of the following carbocations**(1) III > II > I (2) II > III > I (3) I > II > III (4) III > I > II**[JEE-MAIN-2013]**
Q.

**For which of the following molecule significant $\mu^{1} 0$**(1) Only (3) (2) (3) and (4) (3) Only (1) (4) (1) and (2)**[JEE-MAIN-2014]****Download eSaral App for Video Lectures, Complete Revision, Study Material and much more...**

**Sol.**(2) So dipole moment per mole (containing $\mathrm{N}_{\mathrm{A}}$ molecules) is non zero. Some concept applicable for option (4) .

Q.

**The correct order of increasing basicity of the given conjugate base $\left(\mathrm{R}=\mathrm{CH}_{3}\right.$) is :-**$(1) \mathrm{RCO} \overline{\mathrm{O}}<\mathrm{HC} \equiv \overline{\mathrm{C}}<\overline{\mathrm{N}} \mathrm{H}_{2}<\overline{\mathrm{R}}$ (2) $\mathrm{RCO} \overline{\mathrm{O}}<\mathrm{HC} \equiv \overline{\mathrm{C}}<\overline{\mathrm{R}}<\overline{\mathrm{N}} \mathrm{H}_{2}$ (3) $\quad \overline{\mathrm{R}}<\mathrm{HC} \equiv \overline{\mathrm{C}}<\mathrm{RCO} \overline{\mathrm{O}}<\overline{\mathrm{N}} \mathrm{H}_{2}$ (4) $\mathrm{RCO} \overline{\mathrm{O}}<\overline{\mathrm{N} H}_{2}<\mathrm{HC} \equiv \overline{\mathrm{C}}<\overline{\mathrm{R}}$**[AIEEE-2010]****Download eSaral App for Video Lectures, Complete Revision, Study Material and much more...**

**Sol.**(1) Basic strength $\propto \frac{1}{\text { Stability of conjugate base }}$

Q.

**The strongest acid amongst the following compounds is ?**(1) $\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}(\mathrm{Cl}) \mathrm{CO}_{2} \mathrm{H}$ (2) $\mathrm{ClCH}_{2} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{COOH}$ (3) $\mathrm{CH}_{3} \mathrm{COOH}$ (4) HCOOH**[AIEEE-2011]****Download eSaral App for Video Lectures, Complete Revision, Study Material and much more...**

**Sol.**(1) (Acidity a –I effect)

Q.

**The correct order of acid strength of the following compounds :-**A. Phenol B. p-Cresol C. m-Nitrophenol D. p- Nitrophenol (1) C > B > A > D (2) D > C > A > B (3) B > D > A > C (4) A > B > D > C**[AIEEE-2011]**
Q.

**In the following compounds :**the order of basicity is as follows : (1) IV > III > II > I (2) II > III > I > IV (3) I > III > II > IV (4) III > I > II > IV**[JEE(Main)-2012]**
Q.

**The most basic compound among the following is :-**(1) Acetanilide (2) Benzylamine (3) p-Nitro aniline (4) Aniline**[JEE(Main)-2012]****Download eSaral App for Video Lectures, Complete Revision, Study Material and much more...**

**Sol.**(2) Basicity $\propto \frac{1}{\text { Resonance of lone pair e }}$

Q.

**The order of basicity of amines in gaseous state is :-**(1) $3^{\circ}>2^{\circ}>\mathrm{NH}_{3}>1^{\circ}$ (2) $1^{\circ}>2^{\circ}>3^{\circ}>\mathrm{NH}_{3}$ (3) $\mathrm{NH}_{3}>1^{\circ}>2^{\circ}>3^{\circ}$ (4) $3^{\circ}>2^{\circ}>1^{\circ}>\mathrm{NH}_{3}$**[JEE(Main)-2013]****Download eSaral App for Video Lectures, Complete Revision, Study Material and much more...**

**Sol.**(4) Basicity $\propto+I$ effect

Q.

**Arrange the following compounds in order of decreasing acidity :**(1) II > IV > I > III (2) I > II > III > IV (3) III > I > II > IV (4) IV > III > I > II**[JEE(Main)-2013]****Download eSaral App for Video Lectures, Complete Revision, Study Material and much more...**

**Sol.**(3) Acidity $\propto-\mathrm{I} /-\mathrm{R} \propto \frac{1}{+\mathrm{I} /+\mathrm{R}}$

Q.

**The conjugate base of hydrazoic acid is :-**(1) $\mathrm{HN}_{3}^{-}$ (2) $\mathrm{N}_{3}^{-}$ (3) $\mathrm{N}_{2}^{-}$ (4) $\mathrm{N}^{-3}$**[JEE(Main)-2014]****Download eSaral App for Video Lectures, Complete Revision, Study Material and much more...**

**Sol.**(2) $\left(\mathrm{HN}_{3} \longrightarrow \mathrm{N}_{3}+\mathrm{H}^{+}\right)$

Q.

**Which one of the following compounds will not be soluble in sodium bicarbonate ?**(1) Benzene sulphonic acid (2) Benzoic acid (3) o-Nitrophenol (4) 2, 4, 6 – Trinitrophenol**[JEE(Main)-2014]****Download eSaral App for Video Lectures, Complete Revision, Study Material and much more...**

**Sol.**(2) Due to ortho effect

Q.

**Considering the basic strength of amines in aqueous solution, which one has****the smallest $\mathrm{pK}_{\mathrm{b}}$ value ?**(1) $\left(\mathrm{CH}_{3}\right)_{3} \mathrm{N}$ (2) $\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{NH}_{2}$ (3) $\left(\mathrm{CH}_{3}\right)_{2} \mathrm{NH}$ (4) $\mathrm{CH}_{3} \mathrm{NH}_{2}$**[JEE(Main)-2014]****Download eSaral App for Video Lectures, Complete Revision, Study Material and much more...**

**Sol.**(3) $\begin{aligned} \therefore \text { Due to solvation and inductive effect } \\ 2^{\circ}>1^{\circ}>3^{\circ}>0^{\circ} & \mathrm{R}=-\mathrm{CH}_{3} \end{aligned}$

Q.

**Among the following oxoacids, the correct decreasing order of acid strength is :**(1) $\mathrm{HClO}_{4}>\mathrm{HClO}_{3}>\mathrm{HClO}_{2}>\mathrm{HOCl}$ (2) $\mathrm{HClO}_{2}>\mathrm{HClO}_{4}>\mathrm{HClO}_{3}>\mathrm{HOCl}$ (3) $\mathrm{HOCl}>\mathrm{HClO}_{2}>\mathrm{HClO}_{3}>\mathrm{HClO}_{4}$ (4) $\mathrm{HClO}_{4}>\mathrm{HOCl}>\mathrm{HClO}_{2}>\mathrm{HClO}_{3}$**[JEE(Main)-2014]****Download eSaral App for Video Lectures, Complete Revision, Study Material and much more...**

**Sol.**(1) $\therefore$ Acidic $\propto$ more E.R.S. of conjugate base

Q.

**The increasing order of basicity of the following compounds is :**(1) (1) < (1) < (3) < (4) (2) (1) < (1) < (4) < (3) (3) (4) < (2) < (1) < (3) (4) (1) < (2) < (3) < (3)**[JEE(Main)-2018]****Download eSaral App for Video Lectures, Complete Revision, Study Material and much more...**

**Sol.**(2) Order of base nature depends on electron donation tendency. In compoundnitrogen is sp2 hybridized so least basic among all given compound. compoundis very strong nitrogeneous organic base as lone pair of one nitrogen delocalize in resonance and make another nitrogen negativly charged and conjugate acid have two equivalent resonating structure. Thus it is most basic in given compouds.(secondary amine) more basic than (primary amine)

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answers options are usually written wrong while in explanation the options are right

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