Chapter 23

The total number of optically active isomers of the compound \(\mathrm{CH}_{2} \mathrm{OH}-\mathrm{CHBr}-\mathrm{CHOH}-\mathrm{CHBr}-\mathrm{CH}_{2} \mathrm{OH}\) is

The number of isomeric ethers corresponding to the formula \(\mathrm{C}_{5} \mathrm{H}_{12} \mathrm{O}\) is

The number of geometrical isomers of the following alkene \(\mathrm{CH}_{3}-\mathrm{CH}=\mathrm{CH}-\mathrm{CH}=\mathrm{CH}-\mathrm{CH}=\mathrm{CH}-\mathrm{Cl}\) is

How many structural isomers are possible for monobromodichloro benzene?

Underlined carbon is sp \(^{3}\) hybridized in (a) \(\mathrm{CH}_{3} \mathrm{CH}=\underline{\mathrm{CH}}_{2}\) (b) \(\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{NH}_{2}\) (c) \(\mathrm{CH}_{3} \mathrm{CONH}_{2}\) (d) \(\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CN}\)

The incorrect IUPAC name is (a) \(\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{COOC}_{2} \mathrm{H}_{5}\) ethyl butanoate (b) CC(C)CC=O 3-methyl butanal (c) 2-methyl-3-pentanone (d) CC(C)C(C)O 2-methyl-3-butanol

Racemic mixture is formed by mixing two (a) isomeric compounds (b) chiral compounds (c) meso compounds (d) enantiomers with chiral carbon

A similarly between optical and geometrical isomerism is that (a) if in a compound, one is present then so is the other. (b) each forms equal number of isomers for a given compound (c) both are included in stereoisomerism (d) they have no similarly

Which of the following does not show geometrical isomerism? (a) 1, 1-dichloro-1-pentene (b) 1,2 -dichloro-1-pentene (c) 1,3 -dichloro-1-pentene (d) 1,4 -dichlroro-2-pentene

The IUPAC name of \(\mathrm{CH}_{3} \mathrm{COCH}\left(\mathrm{CH}_{3}\right)_{2}\) is (a) 4 -methyl isopropyl ketone (b) 3-methylbutan-2-one (c) isopropylmethyl ketone (d) 2-methylbutan-3-one

The IUPAC name of the following compound is [2004] CC1(C)CCCC(O)C1 (a) 3,3 -dimethyl-1-hydroxycyclohexane (b) 1,1 -dimethyl-3-hydroxycyclohexane (c) 3,3 -dimethyl-1-cyclohexanol (d) 1,1 -dimethyl-3-cyclohexanol.

Which one of the following does not have \(\mathrm{sp}^{2}\) hybridized carbon? [2004] (a) acetone (b) acetic acid (c) acetonitrile (d) acetamide

Which of the following will have a meso isomer also? [2004] (a) 2-chlorobutane (b) 2,3 -dichlorobutane (c) 2,3 -dichloropentane (d) 2-hydroxypropanoic acid

For which of the following parameters of the structural isomers \(\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{OH}\) and \(\mathrm{CH}_{3} \mathrm{OCH}_{3}\) would be expected to have the same values? (Assume ideal behaviour)[2004] (a) heat of vaporization (b) vapour pressure at the same temperature (c) boiling points (d) gaseous densities at the same temperature and pressure

Of the five isomeric hexanes, the isomer which can give two monochlorination compound is \([2005]\) (a) n-hexane (b) 2,3 -dimethylbutane (c) 2,2 -dimethylbutane (d) 2 -methylpentane

Which types of isomerism is shown by 2,3 -dichlorobutane? (a) diastereo (b) optical (c) geometric (d) structural

Increasing order of stability among the three main conformations (eclipse, anti, gauche) of 2 - fluoroethanol is (a) eclipse, gauche, anti (b) gauche, eclipse, anti (c) eclipse, anti, gauche (d) anti, gauche, eclipse

The IUPAC name of the compound shown below is [2006] ClC1CCCC(Br)C1 (a) 2-bromo-6-chlorocyclohex-1-ene (b) 6 -bromo-2-chlorocyclohexene (c) 3-bromo-1-chlorocyclohexene (d) 1-bromo-3-chlorocyclohexene

Which one of the following conformations of cyclohexane is chiral? (a) rigid (b) chair (c) boat (d) twist boat

The IUPAC name of (a) 4,4 - dimethyl-5-diethyl pentane (b) 5,5 -diethyl-4, 4 -dimethyl pentane (c) 3 -ethyl-4, 4-dimethyl heptane (d) 1,1 -diethyl-2, 2 -dimethyl pentane

The absolute configuration of O=C(O)C(O)C(O)C(=O)O is (a) \(\mathrm{S}, \mathrm{S}\) (b) \(\mathrm{R}, \mathrm{R}\) (c) \(\mathrm{R}, \mathrm{S}\) (d) \(\mathrm{S}, \mathrm{R}\)

The correct decreasing order of priority for the functional groups of organic compounds in the IUPAC sys- 19 tem of nomenclature is (a) \(-\mathrm{COOH},-\mathrm{SO}_{3} \mathrm{H},-\mathrm{CONH}_{2},-\mathrm{CHO}\) (b) \(-\mathrm{SO}_{3} \mathrm{H},-\mathrm{COOH},-\mathrm{CONH}_{2},-\mathrm{CHO}\) (c) \(-\mathrm{CHO},-\mathrm{COOH},-\mathrm{SO}_{3} \mathrm{H},-\mathrm{CONH}_{2}\) (d) \(-\mathrm{CONH}_{2},-\mathrm{CHO},-\mathrm{SO}_{3} \mathrm{H},-\mathrm{COOH}\)

The IUPAC name of neopentane is: (a) 2,2 - dimethylpropane (b) 2-mehylpropane (c) 2,2 - dimethylbutane (d) 2-methylbytane

The number of stereo isomers possible for a compound of the molecular formula [2009] \(\mathrm{CH}_{3}-\mathrm{CH}=\mathrm{CH}-\mathrm{CH}(\mathrm{OH})-\mathrm{Me}\) is: (a) 2 (b) 4 (c) 6 (d) 3

Out of the following, the alkene that exhibits optical isomerism is (a) 3 - methyl \(-2\) - pentene (b) 4 - methyl \(-1\) - pentene (c) 3 - methy \(1-1\) - pentene (d) 2 - methyl \(-2\) - pentene

Identify the compound that exhibits tautomerism. [2011] (a) Lactic acid (b) 2-Pentanone (c) Phenol (d) 2-Butene

How many chiral compounds are possible on monochlorination of \(2-\) methyl butane? [2012] (a) 4 (b) 8 (c) 6 (d) 2