Chapter 16

An important chemical method to resolve a racemic mixture makes uses of the formation of $(\mathrm{CBSE}94)$ 1) a mesocompound (2) enantiomers (3) diastereomers (4) racemates

An organic compound ${\mathrm{C}}_4{\mathrm{H}}_8\mathrm{O}$ is found to be optically active. Which of the following could it be? (ISM Dhanbad 94 ) (1) ${\mathrm{CII}}_3{\mathrm{COCII}}_2{\mathrm{CII}}_3$ (2) ${\mathrm{CII}}_3{\mathrm{CH}}_2{\mathrm{CII}}_2\mathrm{CIIO}$ (3) ${\left({\mathrm{CII}}_3\right)}_2\mathrm{CII}$ CIIO (4) ${\mathrm{CII}}_2=\mathrm{CII}\mathrm{CH}(\mathrm{OII}){\mathrm{CH}}_3$

Which of the following will have a mesoisomer also? (AIEEE 2004) (1) 2-Chlorobutane (2) 2,3-Dichloro butane (3) 2,3 -Dichloro pentane (4) 2-Hydroxy propanoic acid

Two isomeric alkenes $\mathrm{A}$ and $\mathrm{B}$ having molecular formula ${\mathrm{C}}_5{\mathrm{H}}_9\mathrm{Cl}$ on adding ${\mathrm{H}}_2$, A gives optically inactive compound, whereas B gives a chiral compound. The two isomers are (1) $\mathrm{\Lambda }$ is 4 -chloro-2-pentene and $\mathrm{B}$ is 4 -chloro-1 pentene. (2) $\mathrm{\Lambda }$ is 3 -chloro-2-pentene and $\mathrm{B}$ is 2 -chloro-2 pentene. (3) $\mathrm{\Lambda }$ is 2 -chloro-3-methyl-2-butenc and $\mathrm{B}$ is 1-chloro-3-methyl-lbutene. (4) $\mathrm{\Lambda }$ is 3 -chloro-1-pentene and $B$ is 1 -chloro-2 pentene.

An optically active alkene with molecular formula ${\mathbf{C}}_6{\mathrm{H}}_{12}$ which upon hydrogenation gives optically inactive alkane is (1) 2 -methyl- 2 -pentene (2) 3-methyl-2-pentene (3) 2 -hexene (4) 3-methyl- 1 -pentene

The necessary and sufficient condition for a molecule to be optically active is that (1) it must contain asymmetric carbon atoms. (2) it must be asymmetric. (3) it must be identical with its mirror image. (4) it must be nonidentical with its mirror image.

A molecule is said to be chiral only if (1) it is superimposable on its mirror image. (2) it is nonsuperimposable on its mirror image. (3) it possess stereogenic centres. (4) it can have different configurations.

Which of the following compounds has an achiral stereoisomer known as mesoisomer? (1) 3-Bromo-2-butanol (2) 2,3-Pentanediol (3) 2,3 -Dibromobutane (4) 2,3 -Dibromobutanoic acid

Which of the following compounds docs not have diastercoisomcrs? (1) 2,3 -Butanediol (2) 2,3-Dibromo pentane (3) 2 -Butenc (4) 2-Butanol