232202
Meso -dibromobutane on dehalogenation gives
1 But-1-ene
2 Cis-2-butene
3 Trans-2-butene
4 Mono bromo product
Explanation:
When subject to dehalogenation, mesodibromobutane gives trans-2-butene.
UP CPMT-2014
GENERAL ORGANIC CHEMISTRY
232203
Which of the following exhibit only optical isomerism?
1
2
3
4 4-chloroheptane
Explanation:
(C) : Contains chiral carbon atom (represented by $\mathrm{C}$ but has no such double bond to which different groups are attached. Hence, it will exhibit only optical isomerism.
UP CPMT-2014
GENERAL ORGANIC CHEMISTRY
232205
How many chiral centres are present in 2methyl butane?
1 0
2 1
3 2
4 3
Explanation:
The structure of 2-methyl butane is Thus, it contains no chiral centre i.e., the carbon, all the four valencies of which are satisfied by four different groups.
UP CPMT-2014
GENERAL ORGANIC CHEMISTRY
232206
The most stable conformation of ethylene chlorohydrin at room temperature is
1 Fully eclipsed
2 Partially eclipsed
3 Gauche
4 Staggered
Explanation:
The order of stability of different conformation of alkanes is Anti (staggered form) $>$ Gauche $>$ eclipsed $>$ full eclipsed. Thus anti-form or staggered conformation is most stable as there is minimum repulsions between the substituents attached tetrahedrally over two carbon atoms. Gauche conformation is also staggered but they have slightly $(3.8 \mathrm{~kJ} / \mathrm{mol})$ more energy than anti form because the substituents are present at nearer position than the anti form. However, it an electrostatic or hydrogen bond occurs between the substituents of carbon atoms, then the skew or gauche conformation may prove to be more convenient.
232202
Meso -dibromobutane on dehalogenation gives
1 But-1-ene
2 Cis-2-butene
3 Trans-2-butene
4 Mono bromo product
Explanation:
When subject to dehalogenation, mesodibromobutane gives trans-2-butene.
UP CPMT-2014
GENERAL ORGANIC CHEMISTRY
232203
Which of the following exhibit only optical isomerism?
1
2
3
4 4-chloroheptane
Explanation:
(C) : Contains chiral carbon atom (represented by $\mathrm{C}$ but has no such double bond to which different groups are attached. Hence, it will exhibit only optical isomerism.
UP CPMT-2014
GENERAL ORGANIC CHEMISTRY
232205
How many chiral centres are present in 2methyl butane?
1 0
2 1
3 2
4 3
Explanation:
The structure of 2-methyl butane is Thus, it contains no chiral centre i.e., the carbon, all the four valencies of which are satisfied by four different groups.
UP CPMT-2014
GENERAL ORGANIC CHEMISTRY
232206
The most stable conformation of ethylene chlorohydrin at room temperature is
1 Fully eclipsed
2 Partially eclipsed
3 Gauche
4 Staggered
Explanation:
The order of stability of different conformation of alkanes is Anti (staggered form) $>$ Gauche $>$ eclipsed $>$ full eclipsed. Thus anti-form or staggered conformation is most stable as there is minimum repulsions between the substituents attached tetrahedrally over two carbon atoms. Gauche conformation is also staggered but they have slightly $(3.8 \mathrm{~kJ} / \mathrm{mol})$ more energy than anti form because the substituents are present at nearer position than the anti form. However, it an electrostatic or hydrogen bond occurs between the substituents of carbon atoms, then the skew or gauche conformation may prove to be more convenient.
232202
Meso -dibromobutane on dehalogenation gives
1 But-1-ene
2 Cis-2-butene
3 Trans-2-butene
4 Mono bromo product
Explanation:
When subject to dehalogenation, mesodibromobutane gives trans-2-butene.
UP CPMT-2014
GENERAL ORGANIC CHEMISTRY
232203
Which of the following exhibit only optical isomerism?
1
2
3
4 4-chloroheptane
Explanation:
(C) : Contains chiral carbon atom (represented by $\mathrm{C}$ but has no such double bond to which different groups are attached. Hence, it will exhibit only optical isomerism.
UP CPMT-2014
GENERAL ORGANIC CHEMISTRY
232205
How many chiral centres are present in 2methyl butane?
1 0
2 1
3 2
4 3
Explanation:
The structure of 2-methyl butane is Thus, it contains no chiral centre i.e., the carbon, all the four valencies of which are satisfied by four different groups.
UP CPMT-2014
GENERAL ORGANIC CHEMISTRY
232206
The most stable conformation of ethylene chlorohydrin at room temperature is
1 Fully eclipsed
2 Partially eclipsed
3 Gauche
4 Staggered
Explanation:
The order of stability of different conformation of alkanes is Anti (staggered form) $>$ Gauche $>$ eclipsed $>$ full eclipsed. Thus anti-form or staggered conformation is most stable as there is minimum repulsions between the substituents attached tetrahedrally over two carbon atoms. Gauche conformation is also staggered but they have slightly $(3.8 \mathrm{~kJ} / \mathrm{mol})$ more energy than anti form because the substituents are present at nearer position than the anti form. However, it an electrostatic or hydrogen bond occurs between the substituents of carbon atoms, then the skew or gauche conformation may prove to be more convenient.
232202
Meso -dibromobutane on dehalogenation gives
1 But-1-ene
2 Cis-2-butene
3 Trans-2-butene
4 Mono bromo product
Explanation:
When subject to dehalogenation, mesodibromobutane gives trans-2-butene.
UP CPMT-2014
GENERAL ORGANIC CHEMISTRY
232203
Which of the following exhibit only optical isomerism?
1
2
3
4 4-chloroheptane
Explanation:
(C) : Contains chiral carbon atom (represented by $\mathrm{C}$ but has no such double bond to which different groups are attached. Hence, it will exhibit only optical isomerism.
UP CPMT-2014
GENERAL ORGANIC CHEMISTRY
232205
How many chiral centres are present in 2methyl butane?
1 0
2 1
3 2
4 3
Explanation:
The structure of 2-methyl butane is Thus, it contains no chiral centre i.e., the carbon, all the four valencies of which are satisfied by four different groups.
UP CPMT-2014
GENERAL ORGANIC CHEMISTRY
232206
The most stable conformation of ethylene chlorohydrin at room temperature is
1 Fully eclipsed
2 Partially eclipsed
3 Gauche
4 Staggered
Explanation:
The order of stability of different conformation of alkanes is Anti (staggered form) $>$ Gauche $>$ eclipsed $>$ full eclipsed. Thus anti-form or staggered conformation is most stable as there is minimum repulsions between the substituents attached tetrahedrally over two carbon atoms. Gauche conformation is also staggered but they have slightly $(3.8 \mathrm{~kJ} / \mathrm{mol})$ more energy than anti form because the substituents are present at nearer position than the anti form. However, it an electrostatic or hydrogen bond occurs between the substituents of carbon atoms, then the skew or gauche conformation may prove to be more convenient.
