Chapter 1: Problem 74
When
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Chapter 1: Problem 74
When
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Which of the following are correct statements? (a) \(\mathrm{BF}_{3}\) and are: \(\mathrm{CCl}_{2}\) electrophiles. (b) Dimethylsulphoxide and dimethyl formamide (DMF) are aprotic solvents. (c) In butadiene \(\mathrm{H}_{2} \mathrm{C}=\mathrm{CH}-\mathrm{CH}=\mathrm{CH}_{2}\) all the three \(\mathrm{C}-\mathrm{C}\) bond lengths are equal. (d) \(\mathrm{CH}_{2}=\mathrm{CH}-\mathrm{Cl}\) has low reactivity because chlorine is attached to an \(\mathrm{sp}^{2}\) carbon.
which of the following statements is not correct? (a) Resonance and tautomerism describe the same phenomenon. (b) A group with a + I effect, attached to a carbocation, increases the stability of the carbocation. (c) Weaker the acid, stronger is its conjugate base. (d) The \(-\mathrm{OH}\) and \(-\mathrm{NH}_{2}\) group attached to an aromatic ring exert \(+\mathrm{M}\) effect.
The IUPAC name of (a) 3 -Methyl pent- 2 -en- 1 -ol (b) 2 -Ethyl pent- 2 -en-5-ol (c) 3 -Ethyl-but-2-en-1-ol (d) 3 , 3 -Methyl ethyl prop-2-en-1-ol
The specific rotation of a pure optically active compound is \(+12^{\circ} .\) The specific rotation of the sample in a reaction with \(20 \%\) racemization and \(80 \%\) retension of configuration will be (a) \(+12^{\circ}\) (b) \(-12^{\circ}\) (c) \(+9.6^{\circ}\) (d) \(-2.4^{\circ}\)
A set which contains an electrophile, a Lewis base and a species containing unpaired electrons among the following is (a) \(\mathrm{Cl}^{-}, \mathrm{AlCl}_{3}\) and \(\mathrm{H}_{2}\) (b) \(\mathrm{SO}_{3},\left(\mathrm{CH}_{3}\right)_{2} \mathrm{O}\), triplet carbene (c) \(\mathrm{Cl}^{-}, \mathrm{HCl}\) and singlet carbene
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