Problem 185
Consider the acidity of the carboxylic acids: (i) \(\mathrm{PhCOOH}\) (ii) \(0-\mathrm{NO}_{2} \mathrm{C}_{6} \mathrm{H}_{4} \mathrm{COOH}\) (iii) \(\mathrm{p}-\mathrm{NO}_{2} \mathrm{C}_{6} \mathrm{H}_{4} \mathrm{COOH}\) (iv) \(\mathrm{m}-\mathrm{NO}_{2} \mathrm{C}_{6} \mathrm{H}_{4} \mathrm{COOH}\) Which of the following order is correct? (a) \(i>\mathrm{ii}>\mathrm{iii}>\mathrm{iv}\) (b) \(\mathrm{ii}>\mathrm{iv}>\mathrm{ui}>\mathrm{i}\) (c) \(\mathrm{ii}>\mathrm{iv}>\mathrm{i}>\mathrm{iii}\) (d) \(\mathrm{ii}>\mathrm{iii}>\mathrm{iv}>\mathrm{i}\)
Problem 187
Due to the presence of an unpaired electron, free radicals are (a) chemically reactive (b) chemically inactive (c) anions (d) cations
Problem 188
Amongst the following the most basic compound is [2005] (a) benzylamine (b) aniline (c) acetanilide (d) p-nitroanil
Problem 190
Tertiary alkyl halides are practically inert to substitution by SN² mechanism because of \(\quad\) [2005] (a) insolubility (b) instability (c) inductive effect (d) steric hindrance
Problem 194
Elimination of bromine from 2 -bromobutane results in the formation of (a) equimolar mixture of 1 and 2 -butene (b) predominantly 2 -butene (c) predominantly 1-butene (d) predominantly 2 -butyne
Problem 196
\(\mathrm{CH}_{3} \mathrm{Br}+\mathrm{Nu} \longrightarrow \mathrm{CH}_{1}-\mathrm{Nu}+\mathrm{Br} \quad\) [2006] The decreasing order of the rate of the above reaction with nucleophiles \(\left(\mathrm{Nu}^{-}\right)\)a to \(\mathrm{d}\) is \(\left[\mathrm{Nu}=\begin{array}{lll}\text { a) } \mathrm{PhO} & \text { (b) } \mathrm{AcO}^{-} & \text {(c) } \mathrm{HO}^{-} & \left.\text {(d) } \mathrm{CH}_{3} \mathrm{O}^{-}\right]\end{array}\right.\) (a) \(\mathrm{d}>\mathrm{c}>\mathrm{a}>\mathrm{b}\) (b) \(\mathrm{d}>\mathrm{c}>\mathrm{b}>\mathrm{a}\) (c) \(a>b>c>d\) (d) \(b>d>c>a\)
Problem 197
The correct order of increasing acid strength of the compound: (1) \(\mathrm{CH}_{3} \mathrm{CO}_{2} \mathrm{H}\) (2) \(\mathrm{MeOCH}_{2} \mathrm{CO}_{2} \mathrm{H}\) (3) \(\mathrm{CF}_{3} \mathrm{CO}_{2} \mathrm{H}\) (4) \((\mathrm{Me})_{2}-\mathrm{CO}_{2} \mathrm{H}\) (a) \(2<4<1<3\) (b) \(4<1<3<2\) (c) \(4<1<2<3\) (d) \(1<4<3<2\)
Problem 198
Reaction of trans-2-phenyl-1-bromocyclopentane on reaction with alcoholic KOH produces (a) 4 -phenylcyclopentene (b) 2-phenylcyclopentene (c) 1 -phenylcyclopentene (d) 3-phenyleyclopentene
Problem 201
The increasing order of stability of the following free radicals is \(\quad\) [2006] (a) \(\left(\mathrm{CH}_{3}\right)_{2} \mathrm{CH}<\left(\mathrm{CH}_{3}\right)_{3} \mathrm{C}<\left(\mathrm{C}_{6} \mathrm{H}_{3}\right)_{2} \mathrm{C} \mathrm{H}<\left(\mathrm{C}_{6} \mathrm{H}_{3}\right)_{3} \dot{\mathrm{C}}\) (b) \(\left(\mathrm{C}_{6} \mathrm{H}_{5}\right), \dot{\mathrm{C}}<\left(\mathrm{C}_{5} \mathrm{H}_{5}\right)_{2} \overrightarrow{\mathrm{C}} \mathrm{H}<\left(\mathrm{CH}_{3}\right)_{3} \dot{\mathrm{C}}<\left(\mathrm{CH}_{3}\right)_{2} \mathrm{CH}\) (c) \(\left(\mathrm{C}_{6} \mathrm{H}_{3}\right)_{2} \dot{\mathrm{C}} \mathrm{H}<\left(\mathrm{C}_{6} \mathrm{H}_{3}\right), \overrightarrow{\mathrm{C}}<\left(\mathrm{CH}_{3}\right)_{3} \overrightarrow{\mathrm{C}}<\left(\mathrm{CH}_{3}\right)_{2} \mathrm{CH}\) (d) \(\left(\mathrm{CH}_{3}\right)_{2} \mathrm{CH}<\left(\mathrm{CH}_{3}\right)_{3} \overrightarrow{\mathrm{C}}<\left(\mathrm{C}_{6} \mathrm{H}_{3}\right)_{3} \mathrm{C}<\left(\mathrm{C}_{6} \mathrm{H}_{4}\right)_{2} \mathrm{CH}\)
Problem 202
Which of the following is the correct order of decreasing SN \(^{2}\) reactivity? \(\quad\) [2007] (a) \(\mathrm{RCH}_{2} \mathrm{X}>\mathrm{R}_{2} \mathrm{CHX}>\mathrm{R}_{3} \mathrm{CX}\) (b) \(\mathrm{R}_{3} \mathrm{CX}>\mathrm{R}_{2} \mathrm{CHX}>\mathrm{RCH}_{2} \mathrm{X}\) (c) \(\mathrm{R}_{2} \mathrm{CHX}>\mathrm{R}_{3} \mathrm{CX}>\mathrm{RCH}_{2} \mathrm{X}\) (d) \(\mathrm{RCH}_{2} \mathrm{X}>\mathrm{R}_{3} \mathrm{CX}>\mathrm{R}_{2} \mathrm{CHX}\)
