232180
An optically active alkene with the M.F. $\mathrm{C}_{6} \mathrm{H}_{12}$ which upon hydrogenation gives optically inactive alkene is :
1 2-hexene
2 3-methyl-2-pentene
3 2-methyl-2-pentene
4 3-methyl-1-pentene
Explanation:
Since an optically active alkene upon hydrogenation gives optically inactive alkane therefore alkane has two identical group i.e. $\mathrm{C}_{2} \mathrm{H}_{5}$ group while an alkene has one vinyl $\left(\mathrm{CH}_{2}=\mathrm{CH}\right)$ and one ethyl group.
Manipal 2018
GENERAL ORGANIC CHEMISTRY
232181
The number of stereoisomers for pent-3-en-ol is:
1 2
2 4
3 3
4 5
Explanation:
The No. of stereoisomer in No. of optically active compound $=4$ Pair
Manipal 2018
GENERAL ORGANIC CHEMISTRY
232182
In $S_{N} 1$ reaction, the racemization takes place. It is due to :
1 inversion of configuration
2 retention of configuration
3 conversion of configuration
4 both (a) and (b)
Explanation:
In $\mathrm{S}_{\mathrm{N}} 1$ reaction the Racemization take place due to inversion and retention of configuration. $\mathrm{S}_{\mathrm{N}} 1$ reaction is unimoleculer nucleophilic substitution reaction. It has carbocation as an itermediate whose stability is $\stackrel{+3^{\circ}>2^{\circ}>1^{\circ}}{\longrightarrow}$ In this reaction retention of configuration is formed. When reaction is $\mathrm{S}_{\mathrm{N}} 2$ then transition state is formed and in this inversion of configuration take place in this case the stability of carbocation is $\stackrel{1^{\circ}>2^{\circ}>3^{\circ}}{\longrightarrow}$
Manipal 2018
GENERAL ORGANIC CHEMISTRY
232229
Which pair of elements has same chemical properties?
1 13,22
2 3,11
3 4,24
4 2,4
Explanation:
The pair 3, 11 has same chemical properties because both belong to the same block and group i.e. I group S-Block so both are metal since it is in group I so it is highly and reactive metal. It is easily with halogen metal and form salt. Example $-\mathrm{Li}^{+}+\mathrm{Cl}^{-} \rightarrow \mathrm{LiCl}$ $\mathrm{Na}^{+}+\mathrm{Cl}^{-} \rightarrow \mathrm{NaCl}$
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GENERAL ORGANIC CHEMISTRY
232180
An optically active alkene with the M.F. $\mathrm{C}_{6} \mathrm{H}_{12}$ which upon hydrogenation gives optically inactive alkene is :
1 2-hexene
2 3-methyl-2-pentene
3 2-methyl-2-pentene
4 3-methyl-1-pentene
Explanation:
Since an optically active alkene upon hydrogenation gives optically inactive alkane therefore alkane has two identical group i.e. $\mathrm{C}_{2} \mathrm{H}_{5}$ group while an alkene has one vinyl $\left(\mathrm{CH}_{2}=\mathrm{CH}\right)$ and one ethyl group.
Manipal 2018
GENERAL ORGANIC CHEMISTRY
232181
The number of stereoisomers for pent-3-en-ol is:
1 2
2 4
3 3
4 5
Explanation:
The No. of stereoisomer in No. of optically active compound $=4$ Pair
Manipal 2018
GENERAL ORGANIC CHEMISTRY
232182
In $S_{N} 1$ reaction, the racemization takes place. It is due to :
1 inversion of configuration
2 retention of configuration
3 conversion of configuration
4 both (a) and (b)
Explanation:
In $\mathrm{S}_{\mathrm{N}} 1$ reaction the Racemization take place due to inversion and retention of configuration. $\mathrm{S}_{\mathrm{N}} 1$ reaction is unimoleculer nucleophilic substitution reaction. It has carbocation as an itermediate whose stability is $\stackrel{+3^{\circ}>2^{\circ}>1^{\circ}}{\longrightarrow}$ In this reaction retention of configuration is formed. When reaction is $\mathrm{S}_{\mathrm{N}} 2$ then transition state is formed and in this inversion of configuration take place in this case the stability of carbocation is $\stackrel{1^{\circ}>2^{\circ}>3^{\circ}}{\longrightarrow}$
Manipal 2018
GENERAL ORGANIC CHEMISTRY
232229
Which pair of elements has same chemical properties?
1 13,22
2 3,11
3 4,24
4 2,4
Explanation:
The pair 3, 11 has same chemical properties because both belong to the same block and group i.e. I group S-Block so both are metal since it is in group I so it is highly and reactive metal. It is easily with halogen metal and form salt. Example $-\mathrm{Li}^{+}+\mathrm{Cl}^{-} \rightarrow \mathrm{LiCl}$ $\mathrm{Na}^{+}+\mathrm{Cl}^{-} \rightarrow \mathrm{NaCl}$
232180
An optically active alkene with the M.F. $\mathrm{C}_{6} \mathrm{H}_{12}$ which upon hydrogenation gives optically inactive alkene is :
1 2-hexene
2 3-methyl-2-pentene
3 2-methyl-2-pentene
4 3-methyl-1-pentene
Explanation:
Since an optically active alkene upon hydrogenation gives optically inactive alkane therefore alkane has two identical group i.e. $\mathrm{C}_{2} \mathrm{H}_{5}$ group while an alkene has one vinyl $\left(\mathrm{CH}_{2}=\mathrm{CH}\right)$ and one ethyl group.
Manipal 2018
GENERAL ORGANIC CHEMISTRY
232181
The number of stereoisomers for pent-3-en-ol is:
1 2
2 4
3 3
4 5
Explanation:
The No. of stereoisomer in No. of optically active compound $=4$ Pair
Manipal 2018
GENERAL ORGANIC CHEMISTRY
232182
In $S_{N} 1$ reaction, the racemization takes place. It is due to :
1 inversion of configuration
2 retention of configuration
3 conversion of configuration
4 both (a) and (b)
Explanation:
In $\mathrm{S}_{\mathrm{N}} 1$ reaction the Racemization take place due to inversion and retention of configuration. $\mathrm{S}_{\mathrm{N}} 1$ reaction is unimoleculer nucleophilic substitution reaction. It has carbocation as an itermediate whose stability is $\stackrel{+3^{\circ}>2^{\circ}>1^{\circ}}{\longrightarrow}$ In this reaction retention of configuration is formed. When reaction is $\mathrm{S}_{\mathrm{N}} 2$ then transition state is formed and in this inversion of configuration take place in this case the stability of carbocation is $\stackrel{1^{\circ}>2^{\circ}>3^{\circ}}{\longrightarrow}$
Manipal 2018
GENERAL ORGANIC CHEMISTRY
232229
Which pair of elements has same chemical properties?
1 13,22
2 3,11
3 4,24
4 2,4
Explanation:
The pair 3, 11 has same chemical properties because both belong to the same block and group i.e. I group S-Block so both are metal since it is in group I so it is highly and reactive metal. It is easily with halogen metal and form salt. Example $-\mathrm{Li}^{+}+\mathrm{Cl}^{-} \rightarrow \mathrm{LiCl}$ $\mathrm{Na}^{+}+\mathrm{Cl}^{-} \rightarrow \mathrm{NaCl}$
232180
An optically active alkene with the M.F. $\mathrm{C}_{6} \mathrm{H}_{12}$ which upon hydrogenation gives optically inactive alkene is :
1 2-hexene
2 3-methyl-2-pentene
3 2-methyl-2-pentene
4 3-methyl-1-pentene
Explanation:
Since an optically active alkene upon hydrogenation gives optically inactive alkane therefore alkane has two identical group i.e. $\mathrm{C}_{2} \mathrm{H}_{5}$ group while an alkene has one vinyl $\left(\mathrm{CH}_{2}=\mathrm{CH}\right)$ and one ethyl group.
Manipal 2018
GENERAL ORGANIC CHEMISTRY
232181
The number of stereoisomers for pent-3-en-ol is:
1 2
2 4
3 3
4 5
Explanation:
The No. of stereoisomer in No. of optically active compound $=4$ Pair
Manipal 2018
GENERAL ORGANIC CHEMISTRY
232182
In $S_{N} 1$ reaction, the racemization takes place. It is due to :
1 inversion of configuration
2 retention of configuration
3 conversion of configuration
4 both (a) and (b)
Explanation:
In $\mathrm{S}_{\mathrm{N}} 1$ reaction the Racemization take place due to inversion and retention of configuration. $\mathrm{S}_{\mathrm{N}} 1$ reaction is unimoleculer nucleophilic substitution reaction. It has carbocation as an itermediate whose stability is $\stackrel{+3^{\circ}>2^{\circ}>1^{\circ}}{\longrightarrow}$ In this reaction retention of configuration is formed. When reaction is $\mathrm{S}_{\mathrm{N}} 2$ then transition state is formed and in this inversion of configuration take place in this case the stability of carbocation is $\stackrel{1^{\circ}>2^{\circ}>3^{\circ}}{\longrightarrow}$
Manipal 2018
GENERAL ORGANIC CHEMISTRY
232229
Which pair of elements has same chemical properties?
1 13,22
2 3,11
3 4,24
4 2,4
Explanation:
The pair 3, 11 has same chemical properties because both belong to the same block and group i.e. I group S-Block so both are metal since it is in group I so it is highly and reactive metal. It is easily with halogen metal and form salt. Example $-\mathrm{Li}^{+}+\mathrm{Cl}^{-} \rightarrow \mathrm{LiCl}$ $\mathrm{Na}^{+}+\mathrm{Cl}^{-} \rightarrow \mathrm{NaCl}$
