Chapter 26

The number of \(\mathrm{H}\)-atoms that can participate when CCC(C)(Br)CC is subjected to elimination is

\(\mathrm{CH}_{3} \mathrm{Mgl}\) is an organometallic compound due to [2002] (a) \(\mathrm{Mg}-\mathrm{l}\) bond (b) C-I bond (c) \(\mathrm{C}-\mathrm{Mg}\) bond (d) C-H bond

When a primary amine reacts with chloroform in ethanolic \(\mathrm{KOH}\), then the product formed is (a) an aldehyde (b) an isocyanide (c) an cyanide (d) an alcohol

Bottles containing \(\mathrm{C}_{6} \mathrm{H}_{3} \mathrm{I}\) and \(\mathrm{C}_{6} \mathrm{H}_{3} \mathrm{CH}_{2} \mathrm{l}\) lost their orig- inal labels. They were labelled \(A\) and \(B\) for testing. \(A\) and B were separately taken in test tubes and boiled with \(\mathrm{NaOH}\) solution. The end solution in each tube was made acidic with dilute \(\mathrm{HNO}_{3}\) and some \(\mathrm{AgNO}_{3}\) solution added. Solution B gave a yellow precipitate. Which one of the following statements is true for the experiment? (a) \(\mathrm{A}\) is \(\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{CH}_{2} \mathrm{I}\) (b) \(\mathrm{A}\) is \(\mathrm{C}_{6} \mathrm{H}_{3} \mathrm{I}\) (c) \(\mathrm{B}\) is \(\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{I}\) (d) addition of \(\mathrm{HNO}_{3}\) was unnecessary

The compound formed on heating chlorobenzene with chloral in the presence of concentrated sulphuric acid is \(\mid 2004]\) (a) gammexane (b) DDT (c) freon (d) hexachloroethane

Acetyl bromide reacts with excess of \(\mathrm{CH}_{3} \mathrm{Mgl}\) followed by treatment with a saturated solution of \(\mathrm{NH}_{4} \mathrm{Cl}\) gives [2004] (a) acetone (b) acetamide (c) 2-methyl-2-propanol (d) acetyl iodide

Which of the following will have a mesoisomer also? (a) 2, 3-dichlorobutane (b) 2,3 -dichloropentane (c) 2-hydroxypropanoic acid (d) 2 -chlorobutane

Which of the following compounds is not chiral? |2004] (a) 2 -chloropentane (b) 1-chloropentane (c) 3 -chloro-2-methylpentane (d) 1 -chloro-2-methylpentane

Alkyl halides react with dialkyl copper reagents to give \(\mid 2005]\) (a) alkenes (b) alkyl copper halides (c) alkanes (d) alkenyl halides

Tertiary alkyl halides are practically inert to substitution by \(\mathrm{S}_{\mathrm{N}^{2}}\) mechanism because of \(|2005|\) (a) insolubility (b) instability (c) inductive effect (d) steric hindrance

Fluorobenzene \(\left(\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{~F}\right)\) can be synthesized in the laboratory \([2006]\) (a) by heating petrol with HF and KF (b) from aniline by diazotization followed by heating the diazonium salt with \(\mathrm{HBF}_{4}\) (c) by direct fluorination of benzene with \(\mathrm{F}_{2}\) gas (d) by reacting bromobenzene with NaF solution

Reaction of trans-2-phenyl-1-bromocyclopentane on reaction with alcoholic KOH produces (a) 4-phenylcyclopentene (b) 2 -phenylcyclopentene (c) 1-phenylcyclopentene (d) 3-phenylcyclopentene

In the following chemical reactions: \(\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{NH}_{2}+\mathrm{CHCl}_{3}+3 \mathrm{KOH} \longrightarrow(\mathrm{A})+(\mathrm{B})+3 \mathrm{H}_{2} \mathrm{O}\) the compounds \((\mathrm{A})\) and \((\mathrm{B})\) are respectively \(\quad\) [2007] (a) \(\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CONH}_{2}\) and \(3 \mathrm{KCl}\) (b) \(\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{NC}\) and \(\mathrm{K}_{2} \mathrm{CO}_{3}\) (c) \(\mathrm{C}_{2} \mathrm{H}_{3} \mathrm{NC}\) and \(3 \mathrm{KCl}\) (d) \(\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{CN}\) and \(3 \mathrm{KCl}\)

Which of the following on heating with aqueous KOH, produces acetaldehyde? (a) \(\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{Cl}\) (b) \(\mathrm{CH}_{2} \mathrm{ClCH}_{2} \mathrm{Cl}\) (c) \(\mathrm{CH}_{3} \mathrm{CHCl}_{2}\) (d) \(\mathrm{CH}_{3} \mathrm{COCl}\)

Compound \(\left(\right.\) A), \(\mathrm{C}_{\mathrm{s}} \mathrm{H}_{9} \mathrm{Br}\), gives a white precipitate when warmed with alcoholic \(\mathrm{AgNO}_{j}\). Oxidation of (A) gives an acid (B), \(\mathrm{C}_{8} \mathrm{H}_{6} \mathrm{O}_{4}\). (B) easily forms anhydride on heating. Identify the compound (A). [2013]\\}

In \(\mathrm{S}_{\mathrm{N}}^{2}\) reactions, the correct order of reactivity for the following compounds: \(\mathrm{CH}_{3} \mathrm{Cl}, \mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{Cl}\), \(\left(\mathrm{CH}_{3}\right)_{2} \mathrm{CHCl}\) and \(\left(\mathrm{CH}_{3}\right)_{3} \mathrm{CCl}\) is: |2014] (a) \(\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{Cl}>\mathrm{CH}_{3} \mathrm{Cl}>\left(\mathrm{CH}_{3}\right)_{2} \mathrm{CHCl}>\left(\mathrm{CH}_{3}\right)_{3} \mathrm{CCl}\) (b) \(\left(\mathrm{CH}_{3}\right)_{2} \mathrm{CHCl}>\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{Cl}>\mathrm{CH}_{3} \mathrm{Cl}>\left(\mathrm{CH}_{3}\right)_{3} \mathrm{CCl}\) (c) \(\mathrm{CH}_{3} \mathrm{Cl}>\left(\mathrm{CH}_{3}\right)_{2} \mathrm{CHCl}>\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{Cl}>\left(\mathrm{CH}_{3}\right)_{3} \mathrm{CCl}\) (d) \(\mathrm{CH}_{3} \mathrm{Cl}>\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{Cl}>\left(\mathrm{CH}_{3}\right)_{2} \mathrm{CHCl}>\left(\mathrm{CH}_{3}\right)_{3} \mathrm{CCl}\)

The synthesis of alkyl fluorides is best accomplished by \(|2015|\) (a) Free radical fluorination (b) Sandmeyer's reaction (c) Finkelstein reaction (d) Swarts reaction