Chapter 26

C-X bond is strongest in (a) \(\mathrm{CH}_{3} \mathrm{Br}\) (b) \(\mathrm{CH}_{3} \mathrm{Cl}\) (c) \(\mathrm{CH}_{3} \mathrm{I}\) (d) \(\mathrm{CH}_{3} \mathrm{~F}\)

C-Cl bond of chlorobenzene in comparison to \(\mathrm{C}-\mathrm{Cl}\) bond in methyl chloride is (a) shorter and weaker (b) shorter and stronger (c) longer and weaker (d) longer and stronger

\(\mathrm{C}_{3} \mathrm{H}_{8}+\mathrm{Cl}_{2} \stackrel{\text { Light }}{\longrightarrow} \mathrm{C}_{3} \mathrm{H}_{7} \mathrm{Cl}+\mathrm{HCl}\) is an example of (a) elimination (b) substitution (c) addition (d) rearrangement reaction

The starting substance for the preparation of iodoform is any one of the following, except (a) \(\mathrm{CH}_{3} \mathrm{CH}(\mathrm{OH}) \mathrm{CH}_{3}\) (b) \(\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{OH}\) (c) \(\mathrm{HCH}_{2} \mathrm{OH}\) (d) \(\mathrm{CH}_{3} \mathrm{COOH}_{3}\)

The following structural formula refers to Clc1ccc(C(c2ccc(Cl)cc2)C(Cl)(Cl)Cl)cc1 (a) DDT (b) RNA (c) DNA (d) \(\mathrm{BHC}\)

\(\mathrm{Cl}_{2}\) reacts with \(\mathrm{CS}_{2}\) in presence of \(\mathrm{I}_{2}\) to form (a) \(\mathrm{CCl}_{4}\) (b) \(\mathrm{Cl}_{3} \mathrm{C}-\mathrm{NO}_{2}\) (c) \(\mathrm{CHCl}_{3}\) (d) \(\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{Cl}\)

The alkyl halide is converted into an alcohol by (a) substitution (b) addition (c) elimination (d) dehydrohalogenation

Which of the following alkyl halides is used as a methylating agent? (a) \(\mathrm{C}_{6} \mathrm{H}_{3} \mathrm{Cl}\) (b) \(\mathrm{C}_{2} \mathrm{H}_{3} \mathrm{Cl}\) (c) \(\mathrm{CH}_{3} \mathrm{I}\) (d) \(\mathrm{C}_{2} \mathrm{H}_{3} \mathrm{Br}\)

Of the following compounds, the one with the lowest boiling point is? (a) pentyl chloride (b) tertiary butyl chloride (c) isobutyl chloride (d) \(\mathrm{n}\)-butyl chloride

Which among MeX, \(\mathrm{RCH}_{2} \mathrm{X}, \mathrm{R}_{2} \mathrm{CHX}, \mathrm{R}_{3} \mathrm{CX}\) is most reactive towards \(S_{N}{ }^{2}\) reaction? (a) \(\mathrm{R}_{3} \mathrm{CX}\) (b) \(\mathrm{RCH}_{2} \mathrm{X}\) (c) \(\mathrm{R}_{2} \mathrm{CHX}\) (d) MeX