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Hydrocarbons

230048 ' $A$ ' and ' $B$ ' respectively are:

1 1-methylcyclohex-1, 3-diene and cyclopentene

2 Cyclohex-1,3-diene and cyclopentene

3 1-methylcyclohex-1,4-diene and 1-methylcyclopent-1ene

4 Cyclohex -1,3-diene and 1-methylcyclopent 1 ene

Explanation:

: When original image cyclohex $- 1, 3$ - diene, react
with $O_{3}$ and then $Zn - H_{2} O$ it gives ethane - 1,2dicarbaldehyde + Glyoxal/oxaldehyde.
When 1-methylcyclopent -1-ene react with $O_{3}$ and then $Zn, H_{2} O$ it gives 5 - oxohexanal.
Hence, $A$ is cyclohex-1,3-diene and $B$ is 1 -
When Hence, A is cycloh methylcyclopent-1-ene.

Shift-I]**

Hydrocarbons

230049 Which one of the following molecules contains only primary and tertiary carbon atoms?

1 2,2-Dimethylbutane

2 3-Methylpentane

3 2,3-Dimethylbutane

4 n-Hexane

5 2-Methylhexane

Explanation:

: 2, 3 - dimethylbutane contains only primary and tertiary carbon atoms.
original image
In 2, 3- dimethyl butane, $C_{1}, C_{2} C_{I}, C_{II}$ are primary carbons and $C_{2}, C_{3}$ are tertiary corbons.

Kerala CEE -03.07.2022

Hydrocarbons

230050 Which one of the following molecules gives four isomeric monochlorides on photochemical chlorination?

1 2-Methylpropane

2 n-Butane

3 2-Methylbutane

4 2,3-Dimethylbutane

5 Propane

Kerala CEE -03.07.2022

Hydrocarbons

230052 The number of sigma bonds in ethane formed by the overlAP of $s p^{3}$ and $s$ orbitals is

1 5

2 6

3 7

4 4

Explanation:

: The molecular formula of ethane is $C_{2} H_{6}$
original image
The $C$ -atom of ethane is ${sp}^{3}$ hybridised. So, the sigma bond between $C - C$ atom is ${sp}^{3} - {sp}^{3}$ sigma bond and the bond formed between $C$ and $H$ are $s p^{3} - s$ sigma bond. Hence, there are $6 {sp}^{3} - s$ sigma bonds in ethane.

AP-EAMCET (Med.)-1999

Hydrocarbons

230048 ' $A$ ' and ' $B$ ' respectively are:

1 1-methylcyclohex-1, 3-diene and cyclopentene

2 Cyclohex-1,3-diene and cyclopentene

3 1-methylcyclohex-1,4-diene and 1-methylcyclopent-1ene

4 Cyclohex -1,3-diene and 1-methylcyclopent 1 ene

Explanation:

: When original image cyclohex $- 1, 3$ - diene, react
with $O_{3}$ and then $Zn - H_{2} O$ it gives ethane - 1,2dicarbaldehyde + Glyoxal/oxaldehyde.
When 1-methylcyclopent -1-ene react with $O_{3}$ and then $Zn, H_{2} O$ it gives 5 - oxohexanal.
Hence, $A$ is cyclohex-1,3-diene and $B$ is 1 -
When Hence, A is cycloh methylcyclopent-1-ene.

Shift-I]**

Hydrocarbons

230049 Which one of the following molecules contains only primary and tertiary carbon atoms?

1 2,2-Dimethylbutane

2 3-Methylpentane

3 2,3-Dimethylbutane

4 n-Hexane

5 2-Methylhexane

Explanation:

: 2, 3 - dimethylbutane contains only primary and tertiary carbon atoms.
original image
In 2, 3- dimethyl butane, $C_{1}, C_{2} C_{I}, C_{II}$ are primary carbons and $C_{2}, C_{3}$ are tertiary corbons.

Kerala CEE -03.07.2022

Hydrocarbons

230050 Which one of the following molecules gives four isomeric monochlorides on photochemical chlorination?

1 2-Methylpropane

2 n-Butane

3 2-Methylbutane

4 2,3-Dimethylbutane

5 Propane

Kerala CEE -03.07.2022

Hydrocarbons

230052 The number of sigma bonds in ethane formed by the overlAP of $s p^{3}$ and $s$ orbitals is

1 5

2 6

3 7

4 4

Explanation:

: The molecular formula of ethane is $C_{2} H_{6}$
original image
The $C$ -atom of ethane is ${sp}^{3}$ hybridised. So, the sigma bond between $C - C$ atom is ${sp}^{3} - {sp}^{3}$ sigma bond and the bond formed between $C$ and $H$ are $s p^{3} - s$ sigma bond. Hence, there are $6 {sp}^{3} - s$ sigma bonds in ethane.

AP-EAMCET (Med.)-1999

Hydrocarbons

230048 ' $A$ ' and ' $B$ ' respectively are:

1 1-methylcyclohex-1, 3-diene and cyclopentene

2 Cyclohex-1,3-diene and cyclopentene

3 1-methylcyclohex-1,4-diene and 1-methylcyclopent-1ene

4 Cyclohex -1,3-diene and 1-methylcyclopent 1 ene

Explanation:

: When original image cyclohex $- 1, 3$ - diene, react
with $O_{3}$ and then $Zn - H_{2} O$ it gives ethane - 1,2dicarbaldehyde + Glyoxal/oxaldehyde.
When 1-methylcyclopent -1-ene react with $O_{3}$ and then $Zn, H_{2} O$ it gives 5 - oxohexanal.
Hence, $A$ is cyclohex-1,3-diene and $B$ is 1 -
When Hence, A is cycloh methylcyclopent-1-ene.

Shift-I]**

Hydrocarbons

230049 Which one of the following molecules contains only primary and tertiary carbon atoms?

1 2,2-Dimethylbutane

2 3-Methylpentane

3 2,3-Dimethylbutane

4 n-Hexane

5 2-Methylhexane

Explanation:

: 2, 3 - dimethylbutane contains only primary and tertiary carbon atoms.
original image
In 2, 3- dimethyl butane, $C_{1}, C_{2} C_{I}, C_{II}$ are primary carbons and $C_{2}, C_{3}$ are tertiary corbons.

Kerala CEE -03.07.2022

Hydrocarbons

230050 Which one of the following molecules gives four isomeric monochlorides on photochemical chlorination?

1 2-Methylpropane

2 n-Butane

3 2-Methylbutane

4 2,3-Dimethylbutane

5 Propane

Kerala CEE -03.07.2022

Hydrocarbons

230052 The number of sigma bonds in ethane formed by the overlAP of $s p^{3}$ and $s$ orbitals is

1 5

2 6

3 7

4 4

Explanation:

: The molecular formula of ethane is $C_{2} H_{6}$
original image
The $C$ -atom of ethane is ${sp}^{3}$ hybridised. So, the sigma bond between $C - C$ atom is ${sp}^{3} - {sp}^{3}$ sigma bond and the bond formed between $C$ and $H$ are $s p^{3} - s$ sigma bond. Hence, there are $6 {sp}^{3} - s$ sigma bonds in ethane.

AP-EAMCET (Med.)-1999

Hydrocarbons

230048 ' $A$ ' and ' $B$ ' respectively are:

1 1-methylcyclohex-1, 3-diene and cyclopentene

2 Cyclohex-1,3-diene and cyclopentene

3 1-methylcyclohex-1,4-diene and 1-methylcyclopent-1ene

4 Cyclohex -1,3-diene and 1-methylcyclopent 1 ene

Explanation:

: When original image cyclohex $- 1, 3$ - diene, react
with $O_{3}$ and then $Zn - H_{2} O$ it gives ethane - 1,2dicarbaldehyde + Glyoxal/oxaldehyde.
When 1-methylcyclopent -1-ene react with $O_{3}$ and then $Zn, H_{2} O$ it gives 5 - oxohexanal.
Hence, $A$ is cyclohex-1,3-diene and $B$ is 1 -
When Hence, A is cycloh methylcyclopent-1-ene.

Shift-I]**

Hydrocarbons

230049 Which one of the following molecules contains only primary and tertiary carbon atoms?

1 2,2-Dimethylbutane

2 3-Methylpentane

3 2,3-Dimethylbutane

4 n-Hexane

5 2-Methylhexane

Explanation:

: 2, 3 - dimethylbutane contains only primary and tertiary carbon atoms.
original image
In 2, 3- dimethyl butane, $C_{1}, C_{2} C_{I}, C_{II}$ are primary carbons and $C_{2}, C_{3}$ are tertiary corbons.

Kerala CEE -03.07.2022

Hydrocarbons

230050 Which one of the following molecules gives four isomeric monochlorides on photochemical chlorination?

1 2-Methylpropane

2 n-Butane

3 2-Methylbutane

4 2,3-Dimethylbutane

5 Propane

Kerala CEE -03.07.2022

Hydrocarbons

230052 The number of sigma bonds in ethane formed by the overlAP of $s p^{3}$ and $s$ orbitals is

1 5

2 6

3 7

4 4

Explanation:

: The molecular formula of ethane is $C_{2} H_{6}$
original image
The $C$ -atom of ethane is ${sp}^{3}$ hybridised. So, the sigma bond between $C - C$ atom is ${sp}^{3} - {sp}^{3}$ sigma bond and the bond formed between $C$ and $H$ are $s p^{3} - s$ sigma bond. Hence, there are $6 {sp}^{3} - s$ sigma bonds in ethane.

AP-EAMCET (Med.)-1999

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