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JEE Advanced > Organic Chemistry Some Basic Principles and Techniques

Explore popular questions from Organic Chemistry Some Basic Principles and Techniques for JEE Advanced. This collection covers Organic Chemistry Some Basic Principles and Techniques previous year JEE Advanced questions hand picked by experienced teachers.

Q 1.

Correct4

Incorrect-1

Molecule in which the distance between the two adjacent carbon atoms is largest is

Ethane

B

Ethene

C

Ethyne

D

Benzene

Explanation

Q 2.

Correct4

Incorrect-1

The compound which is not isomeric with diethyl ether is

A

{tex} n {/tex} -propyl methyl ether

B

butan- 1 - ol

C

2 -methylpropan-2-ol

butanone

Explanation

Q 3.

Correct4

Incorrect-1

The compound {tex} 1,2 {/tex} -butadiene has

A

only {tex}sp{/tex} hybridized carbon atoms

B

only {tex} s p ^ { 2 } {/tex} hybridized carbon atoms

C

both {tex}sp{/tex} and {tex} s p ^ { 2 } {/tex} hybridized carbon atoms

{tex} s p , s p ^ { 2 } {/tex} and {tex} s p ^ { 3 } {/tex} hybridized carbon atoms

Explanation

Q 4.

Correct4

Incorrect-1

Which of the following compounds will exhibit cis-trans (geometrical) isomerism?

2 -butene

B

2 -butyne

C

2 -butanol

D

butanal

Explanation

Q 5.

Correct4

Incorrect-1

The IUPAC name of the compound having the formula

A

{tex} 3,3,3 {/tex} - Trimethyl-{tex}1{/tex}-propene

B

{tex} 1,1,1 - {/tex} Trimethyl- {tex}2{/tex} -propene

{tex} 3,3 {/tex} -Dimethyl- {tex}1{/tex} -butene

D

{tex} 2,2 {/tex} -Dimethyl-{tex}3{/tex}-butene

Explanation

Q 6.

Correct4

Incorrect-1

An isomer of ethanol is:

A

methanol

B

diethyl ether

C

acetone

dimethyl ether

Explanation

Q 7.

Correct4

Incorrect-1

Out of the following compounds, which will have a zero dipole moment?

A

{tex} 1,1 {/tex} -dichloroethylene

B

{tex} c i s - 1,2 {/tex} -dichloroethylene

trans-{tex}1,2{/tex}-dichloroethylene

D

None of these compounds

Explanation

Q 8.

Correct4

Incorrect-1

The bond between {tex}\mathrm{carbon\ atom ( 1)}{/tex} and {tex}\mathrm{carbon\ atom ( 2)}{/tex} in compound {tex} \mathrm { N } \equiv \mathrm { C } - \mathrm { CH } = \mathrm { CH } _ { 2 } {/tex} involves the hybrids as

A

{tex} s p ^ { 2 } {/tex} and {tex} s p ^ { 2 } {/tex}

B

{tex} s p ^ { 3 } {/tex} and {tex} s p {/tex}

{tex} s p {/tex} and {tex} s p ^ { 2 } {/tex}

D

{tex} s p {/tex} and {tex} s p {/tex}

Explanation

Q 9.

Correct4

Incorrect-1

The IUPAC name of the compound {tex} \mathrm { CH } _ { 2 } = \mathrm { CH } - \mathrm { CH } \left( \mathrm { CH } _ { 3 } \right) _ { 2 } {/tex} is

A

1,1 -dimethyl - 2 -propene

3 -methyl - 1 - butene

C

2 -vinylpropane

D

1-isopropylethylene

Explanation

Q 10.

Correct4

Incorrect-1

The products of combustion of an aliphatic thiol (RSH) at {tex} 298 \mathrm { K } {/tex} are

A

{tex} \mathrm { CO } _ { 2 } ( g ) , \mathrm { H } _ { 2 } \mathrm { O } ( g ) {/tex} and {tex} \mathrm { SO } _ { 2 } ( g ) {/tex}

{tex} \mathrm { CO } _ { 2 } ( g ) , \mathrm { H } _ { 2 } \mathrm { O } ( l ) {/tex} and {tex} \mathrm { SO } _ { 2 } ( g ) {/tex}

C

{tex} \mathrm { CO } _ { 2 } ( l ) , \mathrm { H } _ { 2 } \mathrm { O } ( l ) {/tex} and {tex} \mathrm { SO } _ { 2 } ( g ) {/tex}

D

{tex} \mathrm { CO } _ { 2 } ( g ) , \mathrm { H } _ { 2 } \mathrm { O } ( l ) {/tex} and {tex} \mathrm { SO } _ { 2 } ( l ) {/tex}

Explanation

Q 11.

Correct4

Incorrect-1

Allyl isocyanide has:

A

{tex} 9 \sigma {/tex} and {tex} 4 \pi {/tex} bonds

B

{tex} 8 \sigma {/tex} and {tex} 5 \pi {/tex} bonds

{tex} 9 \sigma , 3 \pi {/tex} and {tex}2{/tex} non-bonded electrons

D

{tex} 8 \sigma , 3 \pi {/tex} and {tex}4{/tex} non-bonded electrons

Explanation

Q 12.

Correct4

Incorrect-1

Which of the following hydrocarbons has the lowest dipole moment?

A

{tex} \mathrm { CH } _ { 3 } \mathrm { C } \equiv \mathrm { CCH } _ { 3 } {/tex}

C

{tex} \mathrm { CH } _ { 3 } \mathrm { CH } _ { 2 } \mathrm { C } \equiv \mathrm { CH } {/tex}

D

{tex} \mathrm { CH } _ { 2 } = \mathrm { CH } - \mathrm { C } \equiv \mathrm { CH } {/tex}

Explanation

Q 13.

Correct4

Incorrect-1

In the given conformation, if {tex}\mathrm{C_2}{/tex} is rotated about {tex}\mathrm{C_2-C_3}{/tex} bond anticlockwise by an angle of {tex}120^\circ{/tex} then the conformation obtained is

A

fully eclipsed conformation

B

partially eclipsed conformation

gauche conformation

D

staggered conformation

Explanation


Q 14.

Correct4

Incorrect-1

The IUPAC name of the compound {tex} \mathrm { CH } _ { 2 } = \mathrm { CH } - \mathrm { CH } \left( \mathrm { CH } _ { 3 } \right) _ { 2 } {/tex} is

A

{tex}1,1{/tex}-dimethyl-{tex}2{/tex}-propene

B

{tex}2{/tex}-vinylpropane

{tex}3{/tex}-methyl-{tex}1{/tex}-butene

D

{tex}1{/tex}-isopropylethene

Explanation

Q 15.

Correct4

Incorrect-1

If two compounds have the same empirical formula but different molecular formulae they must have

A

different percentage composition

different molar mass

C

same viscosity

D

same vapour density

Explanation

Q 16.

Correct4

Incorrect-1

The number of stuctural and confifurational isomers of a bromo compound {tex} \mathrm { C } _ { 5 } \mathrm { H } _ { 9 } \mathrm { Br } , {/tex} formed by the addition of HBr to 2 -pentyne respectively, are

A

1 and 2

2 and 4

C

4 and 2

D

2 and 1

Explanation

Q 17.

Correct4

Incorrect-1

Which among the following sulphates is insoluble in water?

A

{tex} \mathrm { CuSO } _ { 4 } {/tex}

B

{tex} \mathrm { CdSO } _ { 4 } {/tex}

{tex} \mathrm { PbSO } _ { 4 } {/tex}

D

{tex} \mathrm { Bi } _ { 2 } \left( \mathrm { SO } _ { 4 } \right) _ { 3 } {/tex}

Explanation

Q 18.

Correct4

Incorrect-1

Which compound will not give positive chromyl chloride test?

A

{tex} \mathrm { CuCl } _ { 2 } {/tex}

{tex} \mathrm { HgCl } _ { 2 } {/tex}

C

{tex} \mathrm { ZnCl } _ { 2 } {/tex}

D

{tex} \mathrm { C } _ { 6 } \mathrm { H } _ { 5 } \mathrm { NH } _ { 3 } ^ { + } \mathrm { Cl } ^ { - } {/tex}

Explanation

{tex} \mathrm { HgCl } _ { 2 } {/tex} does not give chromyl chloride test

Q 19.

Correct4

Incorrect-1

{tex} \mathrm { PbCl } _ { 2 } + \mathrm { Kl } \rightarrow \underset { \text { Yellow ppt } } { [ \mathrm { A } ] } + \mathrm { KCl } {/tex}
{tex} \underset { \text { Yellow ppt } } { [ \mathrm { A } ] } + \underset { \text { excess } } { \mathrm { Kl } } \longrightarrow \underset{\mathrm {soluble}} \mathrm {[ B } ] {/tex}
Compound [A] and [B] are

A

{tex} \mathrm { PbI } _ { 4 } {/tex} and {tex} \mathrm { K } _ { 2 } \left[ \mathrm { PbI } _ { 4 } \right] {/tex} respectively

B

{tex} \mathrm { K } _ { 2 } \left[ \mathrm { PbI } _ { 4 } \right] {/tex} and {tex} \mathrm { PbI } _ { 4 } {/tex} respectively

{tex} \mathrm { PbI } _ { 2 } {/tex} and {tex} \mathrm { K } _ { 2 } \left[ \mathrm { PbI } _ { 4 } \right] {/tex} respectively

D

{tex} \mathrm { PbI } _ { 2 } {/tex} and {tex} \mathrm { K } _ { 2 } \left[ \mathrm { PbI } _ { 2 } \right] {/tex} respectively

Explanation

Q 20.

Correct4

Incorrect-1

The reagent {tex} \mathrm { NH } _ { 4 } \mathrm { Cl } {/tex} and aqueous {tex} \mathrm { NH } _ { 3 } {/tex} precipitate.

A

{tex} \mathrm { Ca } ^ { 2+ } {/tex}

{tex} \mathrm { Al } ^ { 3 + } {/tex}

C

{tex} \mathrm { Mg } ^ { 2 + } {/tex}

D

{tex} \mathrm { Zn }^ { 2+ } {/tex}

Explanation

Q 21.

Correct4

Incorrect-1

Mark the correct statement out of the following

A

Group I basic radicals precipitate as chlorides

B

Group IV basic radicals precipitate as sulphides

C

Group V basic radicals precipitate as carbonates

All of the above statements are correct

Explanation

Q 22.

Correct4

Incorrect-1

Which of the following is not a preliminary test used to detections?

A

Borax bead test

B

Flame test

Brown ring test

D

Microcosmic salt bead test

Explanation

Q 23.

Correct4

Incorrect-1

Which of the following sulphides does not dissolve in hot dilute {tex} \mathrm { HNO } _ { 3 } ? {/tex}

{tex}\mathrm {HgS} {/tex}

B

{tex}\mathrm {CuS} {/tex}

C

{tex}\mathrm {PbS} {/tex}

D

{tex}\mathrm {CdS} {/tex}

Explanation

{tex}\mathrm {HgS} {/tex} does not dissolve in hot dilute {tex}\mathrm {HNO_3}{/tex}

Q 24.

Correct4

Incorrect-1

When {tex} \mathrm { K } _ { 2 } \mathrm { Cr } _ { 2 } \mathrm { O } _ { 7 } {/tex} crystals are heated with concentrated {tex}\mathrm {HCl} {/tex}, the gas evolved is

A

{tex}\mathrm O _ { 2 } {/tex}

{tex} \mathrm { Cl } _ { 2 } {/tex}

C

{tex} \mathrm { CrO_2Cl_2} {/tex}

D

{tex}\mathrm {HCl} {/tex}

Explanation

When {tex}\mathrm {HCl} {/tex} is treated with {tex} \mathrm { K } _ { 2 } \mathrm { Cr } _ { 2 } \mathrm { O } _ { 7 } {/tex}, {tex}\mathrm {Cl}_2{/tex} gas is evolved.