318108
Which one of the following heptanols can be dehydrated to hept-3-ene only?
1 Heptan-3-ol
2 Heptan-4-ol
3 Heptan-2-ol
4 Heptan-1-ol
Explanation:
Heptan-4-ol has similar alkyl group on both ends of the carbon atom bearing - OH group, hence dehydration of alcohol will form only one alkene, not a mixture of two alkenes \(\mathop {{\text{C}}{{\text{H}}_{\text{3}}}{\text{C}}{{\text{H}}_{\text{2}}}{\text{CH = CHC}}{{\text{H}}_{\text{2}}}{\text{C}}{{\text{H}}_{\text{2}}}{\text{C}}{{\text{H}}_{\text{3}}}}\limits_{{\text{Hept - 3 - ene}}} \)
4 \(\mathrm{BaSO}_{4}+\mathrm{H}_{2}\) and \(\mathrm{Na} / \mathrm{NH}_{3(\mathrm{aq})}\)
Explanation:
Alkyne on Birch reduction ( \(\mathrm{Na}\) in liq. \(\mathrm{NH}_{3}\) ) gives \(\mathrm{E}\) (trans) alkene. Alkyne on reduction using Lindlar's catalyst gives Z (cis) alkene.
CHXI13:HYDROCARBONS
318111
The reagent needed for converting
1 Cat.Hydrogenation
2 \(\mathrm{H}_{2}\) /Lindlar catalyst
3 \(\mathrm{Li} / \mathrm{NH}_{3}\)
4 \(\mathrm{LiAlH}_{4}\)
Explanation:
With Lithium in liquid ammonia, trans-alkene is almost an exclusive product.
JEE - 2014
CHXI13:HYDROCARBONS
318112
In preparation of alkene from alcohol using \(\mathrm{Al}_{2} \mathrm{O}_{3}\) which is effective factor?
1 Porosity of \(\mathrm{Al}_{2} \mathrm{O}_{3}\)
2 Temperature
3 Concentration
4 Surface area of \(\mathrm{Al}_{2} \mathrm{O}_{3}\)
Explanation:
The amount of alcohol absorbed depends upon the surface area of\({\rm{A}}{{\rm{l}}_{\rm{2}}}{{\rm{O}}_{\rm{3}}}\).
318108
Which one of the following heptanols can be dehydrated to hept-3-ene only?
1 Heptan-3-ol
2 Heptan-4-ol
3 Heptan-2-ol
4 Heptan-1-ol
Explanation:
Heptan-4-ol has similar alkyl group on both ends of the carbon atom bearing - OH group, hence dehydration of alcohol will form only one alkene, not a mixture of two alkenes \(\mathop {{\text{C}}{{\text{H}}_{\text{3}}}{\text{C}}{{\text{H}}_{\text{2}}}{\text{CH = CHC}}{{\text{H}}_{\text{2}}}{\text{C}}{{\text{H}}_{\text{2}}}{\text{C}}{{\text{H}}_{\text{3}}}}\limits_{{\text{Hept - 3 - ene}}} \)
4 \(\mathrm{BaSO}_{4}+\mathrm{H}_{2}\) and \(\mathrm{Na} / \mathrm{NH}_{3(\mathrm{aq})}\)
Explanation:
Alkyne on Birch reduction ( \(\mathrm{Na}\) in liq. \(\mathrm{NH}_{3}\) ) gives \(\mathrm{E}\) (trans) alkene. Alkyne on reduction using Lindlar's catalyst gives Z (cis) alkene.
CHXI13:HYDROCARBONS
318111
The reagent needed for converting
1 Cat.Hydrogenation
2 \(\mathrm{H}_{2}\) /Lindlar catalyst
3 \(\mathrm{Li} / \mathrm{NH}_{3}\)
4 \(\mathrm{LiAlH}_{4}\)
Explanation:
With Lithium in liquid ammonia, trans-alkene is almost an exclusive product.
JEE - 2014
CHXI13:HYDROCARBONS
318112
In preparation of alkene from alcohol using \(\mathrm{Al}_{2} \mathrm{O}_{3}\) which is effective factor?
1 Porosity of \(\mathrm{Al}_{2} \mathrm{O}_{3}\)
2 Temperature
3 Concentration
4 Surface area of \(\mathrm{Al}_{2} \mathrm{O}_{3}\)
Explanation:
The amount of alcohol absorbed depends upon the surface area of\({\rm{A}}{{\rm{l}}_{\rm{2}}}{{\rm{O}}_{\rm{3}}}\).
318108
Which one of the following heptanols can be dehydrated to hept-3-ene only?
1 Heptan-3-ol
2 Heptan-4-ol
3 Heptan-2-ol
4 Heptan-1-ol
Explanation:
Heptan-4-ol has similar alkyl group on both ends of the carbon atom bearing - OH group, hence dehydration of alcohol will form only one alkene, not a mixture of two alkenes \(\mathop {{\text{C}}{{\text{H}}_{\text{3}}}{\text{C}}{{\text{H}}_{\text{2}}}{\text{CH = CHC}}{{\text{H}}_{\text{2}}}{\text{C}}{{\text{H}}_{\text{2}}}{\text{C}}{{\text{H}}_{\text{3}}}}\limits_{{\text{Hept - 3 - ene}}} \)
4 \(\mathrm{BaSO}_{4}+\mathrm{H}_{2}\) and \(\mathrm{Na} / \mathrm{NH}_{3(\mathrm{aq})}\)
Explanation:
Alkyne on Birch reduction ( \(\mathrm{Na}\) in liq. \(\mathrm{NH}_{3}\) ) gives \(\mathrm{E}\) (trans) alkene. Alkyne on reduction using Lindlar's catalyst gives Z (cis) alkene.
CHXI13:HYDROCARBONS
318111
The reagent needed for converting
1 Cat.Hydrogenation
2 \(\mathrm{H}_{2}\) /Lindlar catalyst
3 \(\mathrm{Li} / \mathrm{NH}_{3}\)
4 \(\mathrm{LiAlH}_{4}\)
Explanation:
With Lithium in liquid ammonia, trans-alkene is almost an exclusive product.
JEE - 2014
CHXI13:HYDROCARBONS
318112
In preparation of alkene from alcohol using \(\mathrm{Al}_{2} \mathrm{O}_{3}\) which is effective factor?
1 Porosity of \(\mathrm{Al}_{2} \mathrm{O}_{3}\)
2 Temperature
3 Concentration
4 Surface area of \(\mathrm{Al}_{2} \mathrm{O}_{3}\)
Explanation:
The amount of alcohol absorbed depends upon the surface area of\({\rm{A}}{{\rm{l}}_{\rm{2}}}{{\rm{O}}_{\rm{3}}}\).
318108
Which one of the following heptanols can be dehydrated to hept-3-ene only?
1 Heptan-3-ol
2 Heptan-4-ol
3 Heptan-2-ol
4 Heptan-1-ol
Explanation:
Heptan-4-ol has similar alkyl group on both ends of the carbon atom bearing - OH group, hence dehydration of alcohol will form only one alkene, not a mixture of two alkenes \(\mathop {{\text{C}}{{\text{H}}_{\text{3}}}{\text{C}}{{\text{H}}_{\text{2}}}{\text{CH = CHC}}{{\text{H}}_{\text{2}}}{\text{C}}{{\text{H}}_{\text{2}}}{\text{C}}{{\text{H}}_{\text{3}}}}\limits_{{\text{Hept - 3 - ene}}} \)
4 \(\mathrm{BaSO}_{4}+\mathrm{H}_{2}\) and \(\mathrm{Na} / \mathrm{NH}_{3(\mathrm{aq})}\)
Explanation:
Alkyne on Birch reduction ( \(\mathrm{Na}\) in liq. \(\mathrm{NH}_{3}\) ) gives \(\mathrm{E}\) (trans) alkene. Alkyne on reduction using Lindlar's catalyst gives Z (cis) alkene.
CHXI13:HYDROCARBONS
318111
The reagent needed for converting
1 Cat.Hydrogenation
2 \(\mathrm{H}_{2}\) /Lindlar catalyst
3 \(\mathrm{Li} / \mathrm{NH}_{3}\)
4 \(\mathrm{LiAlH}_{4}\)
Explanation:
With Lithium in liquid ammonia, trans-alkene is almost an exclusive product.
JEE - 2014
CHXI13:HYDROCARBONS
318112
In preparation of alkene from alcohol using \(\mathrm{Al}_{2} \mathrm{O}_{3}\) which is effective factor?
1 Porosity of \(\mathrm{Al}_{2} \mathrm{O}_{3}\)
2 Temperature
3 Concentration
4 Surface area of \(\mathrm{Al}_{2} \mathrm{O}_{3}\)
Explanation:
The amount of alcohol absorbed depends upon the surface area of\({\rm{A}}{{\rm{l}}_{\rm{2}}}{{\rm{O}}_{\rm{3}}}\).
318108
Which one of the following heptanols can be dehydrated to hept-3-ene only?
1 Heptan-3-ol
2 Heptan-4-ol
3 Heptan-2-ol
4 Heptan-1-ol
Explanation:
Heptan-4-ol has similar alkyl group on both ends of the carbon atom bearing - OH group, hence dehydration of alcohol will form only one alkene, not a mixture of two alkenes \(\mathop {{\text{C}}{{\text{H}}_{\text{3}}}{\text{C}}{{\text{H}}_{\text{2}}}{\text{CH = CHC}}{{\text{H}}_{\text{2}}}{\text{C}}{{\text{H}}_{\text{2}}}{\text{C}}{{\text{H}}_{\text{3}}}}\limits_{{\text{Hept - 3 - ene}}} \)
4 \(\mathrm{BaSO}_{4}+\mathrm{H}_{2}\) and \(\mathrm{Na} / \mathrm{NH}_{3(\mathrm{aq})}\)
Explanation:
Alkyne on Birch reduction ( \(\mathrm{Na}\) in liq. \(\mathrm{NH}_{3}\) ) gives \(\mathrm{E}\) (trans) alkene. Alkyne on reduction using Lindlar's catalyst gives Z (cis) alkene.
CHXI13:HYDROCARBONS
318111
The reagent needed for converting
1 Cat.Hydrogenation
2 \(\mathrm{H}_{2}\) /Lindlar catalyst
3 \(\mathrm{Li} / \mathrm{NH}_{3}\)
4 \(\mathrm{LiAlH}_{4}\)
Explanation:
With Lithium in liquid ammonia, trans-alkene is almost an exclusive product.
JEE - 2014
CHXI13:HYDROCARBONS
318112
In preparation of alkene from alcohol using \(\mathrm{Al}_{2} \mathrm{O}_{3}\) which is effective factor?
1 Porosity of \(\mathrm{Al}_{2} \mathrm{O}_{3}\)
2 Temperature
3 Concentration
4 Surface area of \(\mathrm{Al}_{2} \mathrm{O}_{3}\)
Explanation:
The amount of alcohol absorbed depends upon the surface area of\({\rm{A}}{{\rm{l}}_{\rm{2}}}{{\rm{O}}_{\rm{3}}}\).
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