General Organic Chemistry & Isomerism · JEE Main previous year questions

For which of the following parameters the structural isomers ${\mathrm{C}}_2{\mathrm{H}}_5\mathrm{OH}$ and $\mathrm{C}{\mathrm{H}}_3\mathrm{OC}{\mathrm{H}}_3$ would be expected to have the same values? (Assume ideal behaviour)

1. A.Heat of vaporization
2. B.Gaseous densities at the same temperature and pressure
3. C.Boiling points
4. D.Vapour pressure at the same temperature

The compound formed in the positive test for nitrogen with the Lassaigne solution of an organic compound is

1. A.$\mathrm{F}{\mathrm{e}}_4[\mathrm{Fe}(\mathrm{CN}{)}_6{]}_3$
2. B.$\mathrm{N}{\mathrm{a}}_4[\mathrm{Fe}(\mathrm{CN}{)}_5\mathrm{NOS}]$
3. C.$\mathrm{Fe}(\mathrm{CN}{)}_3$
4. D.$\mathrm{N}{\mathrm{a}}_3[\mathrm{Fe}(\mathrm{CN}{)}_6]$

1. A.
2. B.
3. C.
4. D.

1. A.$3,3$-dimethyl - $1$ - cyclohexanol
2. B.$1,1$-dimethyl- $3$ -hydroxy cyclohexane
3. C.$3,3$-dimethyl- $1$ -hydroxy cyclohexane
4. D.$1,1$-dimethyl - $3$ - cyclohexanol

The soldiers of Napolean army while at Alps during freezing winter suffered a serious problem as regards to the tin buttons of their uniforms. White metallic tin buttons got converted to grey power. The transformation is related to :

1. A.a change in the partial pressure of oxygen in the air
2. B.a change in the crystalline structure of tin
3. C.an interaction with nitrogen of the air at very low temperature
4. D.an interaction with water vapor contained in the humid air

Arrangement of $(\mathrm{C}{\mathrm{H}}_3{)}_3\mathrm{C}$-, $(\mathrm{C}{\mathrm{H}}_3{)}_2\mathrm{CH}$-, $\mathrm{C}{\mathrm{H}}_3$-$\mathrm{C}{\mathrm{H}}_2$- when attached to benzyl or an unsaturated group in increasing order of inductive effect is

1. A.$(\mathrm{C}{\mathrm{H}}_3{)}_3\mathrm{C}$- < $(\mathrm{C}{\mathrm{H}}_3{)}_2\mathrm{CH}$- < $\mathrm{C}{\mathrm{H}}_3$-$\mathrm{C}{\mathrm{H}}_2$
2. B.$\mathrm{C}{\mathrm{H}}_3$-$\mathrm{C}{\mathrm{H}}_2$- < $(\mathrm{C}{\mathrm{H}}_3{)}_2\mathrm{CH}$- < $(\mathrm{C}{\mathrm{H}}_3{)}_3\mathrm{C}$-
3. C.$(\mathrm{C}{\mathrm{H}}_3{)}_2\mathrm{CH}$- < $(\mathrm{C}{\mathrm{H}}_3{)}_3\mathrm{C}$- < $\mathrm{C}{\mathrm{H}}_3$-$\mathrm{C}{\mathrm{H}}_2$
4. D.$(\mathrm{C}{\mathrm{H}}_3{)}_3\mathrm{C}$- < $\mathrm{C}{\mathrm{H}}_3$-$\mathrm{C}{\mathrm{H}}_2$- < $\mathrm{C}{\mathrm{H}}_3{)}_2\mathrm{CH}$-

A similarity between optical and geometrical isomerism is that

1. A.each forms equal number of isomers for a given compound
2. B.if in a compound one is present then so is the other
3. C.both are included in stereoisomerism
4. D.they have no similarity

Which of the following does not show geometrical isomerism?

1. A.1,2-dichloro-1-pentene
2. B.1,3-dichloro-2-pentene
3. C.1,1-dichloro-1-pentene
4. D.1,4-dichloro-2-pentene

Which of the following compounds has wrong $IUPAC$ name ?

1. A.$\mathrm{C}{\mathrm{H}}_3-\mathrm{C}{\mathrm{H}}_2-\mathrm{C}{\mathrm{H}}_2-\mathrm{COO}-\mathrm{C}{\mathrm{H}}_2\mathrm{C}{\mathrm{H}}_3$ $⟶$ ethyl butanoate
2. B.$\mathrm{C}{\mathrm{H}}_3-\mathrm{CH}(\mathrm{CH})-\mathrm{C}{\mathrm{H}}_2-\mathrm{CHO}$ $⟶$ 3 - methyl-butanal
3. C.$\mathrm{C}{\mathrm{H}}_3-\mathrm{CH}(\mathrm{OH})-\mathrm{CH}(\mathrm{C}{\mathrm{H}}_3)-\mathrm{C}{\mathrm{H}}_3$ $⟶$ 2 - methyl- 3 -butanal
4. D.$\mathrm{C}{\mathrm{H}}_3-\mathrm{CH}(\mathrm{C}{\mathrm{H}}_3)-\mathrm{CO}-\mathrm{C}{\mathrm{H}}_2-\mathrm{C}{\mathrm{H}}_3$ $⟶$ 2 - methyl-3-pentanone

Following types of compounds (as $I,II$ ) I: $\mathrm{C}{\mathrm{H}}_3\mathrm{CH}=\mathrm{CHC}{\mathrm{H}}_3$ II: $\mathrm{C}{\mathrm{H}}_3\mathrm{CH}(\mathrm{OH})\mathrm{C}{\mathrm{H}}_2\mathrm{C}{\mathrm{H}}_3$ are studied in terms of isomerism in :

1. A.chain isomerism
2. B.position isomerism
3. C.conformers
4. D.stereoisomerism