Haloalkanes & Haloarenes · JEE Main previous year questions

1. A.(A) < (B) < (D) < (C)
2. B.(B) < (C) < (D) < (A)
3. C.(B) < (A) < (D) < (C)
4. D.(B) < (C) < (A) < (D)

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

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

The aldehydes which will not form Grignard product with one equivalent of Grignard reagent are - (A) ${\mathrm{C}}_6{\mathrm{H}}_5\mathrm{CHO}$ (benzaldehyde) (B) $\mathrm{H}{\mathrm{O}}_2\mathrm{C}-{\mathrm{C}}_6{\mathrm{H}}_4-\mathrm{CHO}$ (para) (C) ${\mathrm{H}}_3\mathrm{CO}-{\mathrm{C}}_6{\mathrm{H}}_4-\mathrm{CHO}$ (para) (D) $\mathrm{HO}{\mathrm{H}}_2\mathrm{C}-{\mathrm{C}}_6{\mathrm{H}}_4-\mathrm{CHO}$ (para)

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

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

In ${\mathrm{S}}_{\mathrm{N}}2$ reactions, the correct order of reactivity for the following compounds: $\mathrm{C}{\mathrm{H}}_3\mathrm{Cl}$, $\mathrm{C}{\mathrm{H}}_3\mathrm{C}{\mathrm{H}}_2\mathrm{Cl}$, $(\mathrm{C}{\mathrm{H}}_3{)}_2\mathrm{CHCl}$ and $(\mathrm{C}{\mathrm{H}}_3{)}_3\mathrm{CCl}$ is:

1. A.$\mathrm{C}{\mathrm{H}}_3\mathrm{C}{\mathrm{H}}_2\mathrm{Cl}>\mathrm{C}{\mathrm{H}}_3\mathrm{Cl}>(\mathrm{C}{\mathrm{H}}_3{)}_2\mathrm{CHCl}>(\mathrm{C}{\mathrm{H}}_3{)}_3\mathrm{CCl}$
2. B.$(\mathrm{C}{\mathrm{H}}_3{)}_2\mathrm{CHCl}>\mathrm{C}{\mathrm{H}}_3\mathrm{C}{\mathrm{H}}_2\mathrm{Cl}>\mathrm{C}{\mathrm{H}}_3\mathrm{Cl}>(\mathrm{C}{\mathrm{H}}_3{)}_3\mathrm{CCl}$
3. C.$\mathrm{C}{\mathrm{H}}_3\mathrm{Cl}>(\mathrm{C}{\mathrm{H}}_3{)}_2\mathrm{CHCl}>\mathrm{C}{\mathrm{H}}_3\mathrm{C}{\mathrm{H}}_2\mathrm{Cl}>(\mathrm{C}{\mathrm{H}}_3{)}_3\mathrm{CCl}$
4. D.$\mathrm{C}{\mathrm{H}}_3\mathrm{Cl}>\mathrm{C}{\mathrm{H}}_3\mathrm{C}{\mathrm{H}}_2\mathrm{Cl}>(\mathrm{C}{\mathrm{H}}_3{)}_2\mathrm{CHCl}>(\mathrm{C}{\mathrm{H}}_3{)}_3\mathrm{CCl}$

Tertiary alkyl halides are practically inert to substitution by ${\mathrm{S}}_{\mathrm{N}}2$ mechanism because of

1. A.insolubility
2. B.instability
3. C.inductive effect
4. D.steric hindrance