Chapter 24

Which of the following mixture can be separated by steam distillation? (a) Benzoic acid and \(\mathrm{NaCl}\) (b) Acetone and methanol (c) Aniline and chlorobenzene (d) \(\mathrm{O}^{-}\)Nitrophenol and p-nitrophenol

Which of the following phrases is/are not correctly associated with \(\mathrm{S}_{\mathrm{N}} 1\) reaction? (a) Rate of the reaction is affected by polarity of solvent. (b) The strength of nucleophile is important in determining rate of the reaction. (c) The reaction proceeds with complete inversion of configuration. (d) Neopentyl halide gives no rearranged product by \(\mathrm{S}_{\mathrm{N}} 1\) mechanism.

Hyper conjugation is possible in (a) \(\mathrm{CH}_{3} \mathrm{CH}_{2}^{\ominus}\) (b) Cc1ccccc1 (c) \(\mathrm{CH}_{2}=\mathrm{CH}_{2}\) (d) CCC(C)(C)C

Match the following \begin{tabular}{ll} \hline Column-1 & Column-II \\ \hline (a) \(\mathrm{Hg}_{2}^{2+}\) & (p) Nucleophile \\ (b) \(\mathrm{AlCl}_{3}\) & (q) Catalyst \\ (c) \(\mathrm{Br}\) & (r) Lewis acid \\ (d) \(\mathrm{H}^{+}\) & (s) Soft acid \\ & (t) Electrophile \end{tabular}

In the molecule \(\mathrm{CH}_{2}=\mathrm{C}=\mathrm{C}=\mathrm{CH}_{2}\), number of carbon atoms in sp hybrid state is

Among the following groups, \(-\mathrm{CH}_{3},-\mathrm{Cl},-\mathrm{OCH}_{3}\), \(-\mathrm{CHO},-\mathrm{CN},-\mathrm{NO}_{2}\) and \(-\mathrm{COOH}\), number of meta directing groups is

In the following benzyl/allyl system 12002 or [R]C=C [R]c1ccccc1 ( \(\mathrm{R}\) is alkyl group)decreasing order of inductive effect is (a) \(\left(\mathrm{CH}_{3}\right)_{3} \mathrm{C}->\left(\mathrm{CH}_{3}\right)_{2} \mathrm{CH}->\mathrm{CH}_{3} \mathrm{CH}_{2}-\) (b) \(\mathrm{CH}_{3} \mathrm{CH}_{2}->\left(\mathrm{CH}_{3}\right)_{2} \mathrm{CH}->\left(\mathrm{CH}_{3}\right)_{3} \mathrm{C}-\) (c) \(\left.\mathrm{CH}_{2}\right)_{2} \mathrm{CH}->\mathrm{CH}_{3} \mathrm{CH}_{2} \rightarrow\left(\mathrm{CH}_{2}\right)_{3} \mathrm{C}-\) (d) \(\left(\mathrm{CH}_{2}\right)_{3} \mathrm{C}->\mathrm{CH}_{3} \mathrm{CH}_{2}->\left(\mathrm{CH}_{3}\right)_{2} \mathrm{CH}-\)

The reaction \(\left(\mathrm{CH}_{3}\right)_{3} \mathrm{C}-\mathrm{Br} \stackrel{\mathrm{H}, \mathrm{O}}{\longrightarrow}\left(\mathrm{CH}_{3}\right)_{3} \mathrm{C}-\mathrm{OH}\) is \([2003 \mid\) (a) addition reaction (b) substitution reaction (c) free radical reaction (d) elimination reaction

The correct order of increasing basic nature for the bases \(\mathrm{NH}_{3}, \mathrm{CH}_{3} \mathrm{NH}_{2}\), and \(\left(\mathrm{CH}_{3}\right)_{2} \mathrm{NH}\) is 12003 (a) \(\mathrm{CH}_{3} \mathrm{NH}_{2}<\mathrm{NH}_{3}<\left(\mathrm{CH}_{3}\right)_{2} \mathrm{NH}\) (b) \(\left(\mathrm{CH}_{3}\right)_{2} \mathrm{NH}<\mathrm{NH}_{1}<\mathrm{CH}_{3} \mathrm{NH}_{2}\) (c) \(\mathrm{NH}_{3}<\mathrm{CH}_{3} \mathrm{NH}_{2}<\left(\mathrm{CH}_{2}\right)_{2} \mathrm{NH}\) (d) \(\mathrm{CH}_{3} \mathrm{NH}_{2}<\left(\mathrm{CH}_{3}\right)_{2} \mathrm{NH}<\mathrm{NH}_{3}\)

During dehydration of alcohols to alkenes by heating with concentration \(\mathrm{H}_{2} \mathrm{SO}_{4}\) the initiation step is \([\mathbf{2 0 0 3} \mid\) (a) protonation of alcohol molecule (b) formation of carbocation (c) elimination of water (d) formation of an ester