NEET Test Series from KOTA - 10 Papers In MS WORD
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Hydrocarbons
230134
The product/s of following reaction is (are) $\mathrm{C}_2 \mathrm{H}_5 \mathrm{Br}+2 \mathrm{Na}+\mathrm{CH}_3 \mathrm{Br} \stackrel{\text { dryether }}{\longrightarrow}$ ?
1 ethane
2 propane
3 butane
4 ethane, propane and butane.
Explanation:
: When two different alkyl halides are heated with sodium metal in the presence of dry ether, a mixture of different alkenes is obtained. This reaction is known as wurtz reaction
AMU-2014
Hydrocarbons
230135
Among the following 1-butane (I), cis-2butene (II), Trans-2-butene (III), the decreasing order of stability is
1 II $>$ I $>$ III
2 III $>$ II $>$ I
3 II $>$ III $>$ I
4 I $>$ III $>$ II
Explanation:
: Heat of Hydrogenation shows that greater the no. of alkyl group attached to the double bonded carbon atoms, greater is the stability (i.e., Lower is the heat of Hydrogenation) of the alkene. Relative stability of these alkenes follows the sequence $:-$ III $>$ II $>$ I Trans-but-2-ene (III) is more stable than cis-but-2-ene (II) in which the two methyl group are close together and hence then electronic clouds repel each other.
AMU -2008
Hydrocarbons
230137
Which of the following compounds will be formed as a major product on treatment of 2 bromobutane with ethenolic $\mathrm{KOH}$ ?
1
2
3
4
Explanation:
According to Saytzeff's rule, during the dehydrohalogenation of secondary and tertiary haloalkanes, the hydrogen atom is preferentially eliminated from the adjacent carbon atom with lesser number of hydrogen atoms.
AMU-2006
Hydrocarbons
230140
Ethylmagnesium iodide reacts with propylamine to give
1 propane
2 ethyl alcohol
3 ethane
4 ethene
Explanation:
: When ethyl magnesium iodide react with propylamine in presence of $\mathrm{HBr}$ to give ethane.
230134
The product/s of following reaction is (are) $\mathrm{C}_2 \mathrm{H}_5 \mathrm{Br}+2 \mathrm{Na}+\mathrm{CH}_3 \mathrm{Br} \stackrel{\text { dryether }}{\longrightarrow}$ ?
1 ethane
2 propane
3 butane
4 ethane, propane and butane.
Explanation:
: When two different alkyl halides are heated with sodium metal in the presence of dry ether, a mixture of different alkenes is obtained. This reaction is known as wurtz reaction
AMU-2014
Hydrocarbons
230135
Among the following 1-butane (I), cis-2butene (II), Trans-2-butene (III), the decreasing order of stability is
1 II $>$ I $>$ III
2 III $>$ II $>$ I
3 II $>$ III $>$ I
4 I $>$ III $>$ II
Explanation:
: Heat of Hydrogenation shows that greater the no. of alkyl group attached to the double bonded carbon atoms, greater is the stability (i.e., Lower is the heat of Hydrogenation) of the alkene. Relative stability of these alkenes follows the sequence $:-$ III $>$ II $>$ I Trans-but-2-ene (III) is more stable than cis-but-2-ene (II) in which the two methyl group are close together and hence then electronic clouds repel each other.
AMU -2008
Hydrocarbons
230137
Which of the following compounds will be formed as a major product on treatment of 2 bromobutane with ethenolic $\mathrm{KOH}$ ?
1
2
3
4
Explanation:
According to Saytzeff's rule, during the dehydrohalogenation of secondary and tertiary haloalkanes, the hydrogen atom is preferentially eliminated from the adjacent carbon atom with lesser number of hydrogen atoms.
AMU-2006
Hydrocarbons
230140
Ethylmagnesium iodide reacts with propylamine to give
1 propane
2 ethyl alcohol
3 ethane
4 ethene
Explanation:
: When ethyl magnesium iodide react with propylamine in presence of $\mathrm{HBr}$ to give ethane.
230134
The product/s of following reaction is (are) $\mathrm{C}_2 \mathrm{H}_5 \mathrm{Br}+2 \mathrm{Na}+\mathrm{CH}_3 \mathrm{Br} \stackrel{\text { dryether }}{\longrightarrow}$ ?
1 ethane
2 propane
3 butane
4 ethane, propane and butane.
Explanation:
: When two different alkyl halides are heated with sodium metal in the presence of dry ether, a mixture of different alkenes is obtained. This reaction is known as wurtz reaction
AMU-2014
Hydrocarbons
230135
Among the following 1-butane (I), cis-2butene (II), Trans-2-butene (III), the decreasing order of stability is
1 II $>$ I $>$ III
2 III $>$ II $>$ I
3 II $>$ III $>$ I
4 I $>$ III $>$ II
Explanation:
: Heat of Hydrogenation shows that greater the no. of alkyl group attached to the double bonded carbon atoms, greater is the stability (i.e., Lower is the heat of Hydrogenation) of the alkene. Relative stability of these alkenes follows the sequence $:-$ III $>$ II $>$ I Trans-but-2-ene (III) is more stable than cis-but-2-ene (II) in which the two methyl group are close together and hence then electronic clouds repel each other.
AMU -2008
Hydrocarbons
230137
Which of the following compounds will be formed as a major product on treatment of 2 bromobutane with ethenolic $\mathrm{KOH}$ ?
1
2
3
4
Explanation:
According to Saytzeff's rule, during the dehydrohalogenation of secondary and tertiary haloalkanes, the hydrogen atom is preferentially eliminated from the adjacent carbon atom with lesser number of hydrogen atoms.
AMU-2006
Hydrocarbons
230140
Ethylmagnesium iodide reacts with propylamine to give
1 propane
2 ethyl alcohol
3 ethane
4 ethene
Explanation:
: When ethyl magnesium iodide react with propylamine in presence of $\mathrm{HBr}$ to give ethane.
230134
The product/s of following reaction is (are) $\mathrm{C}_2 \mathrm{H}_5 \mathrm{Br}+2 \mathrm{Na}+\mathrm{CH}_3 \mathrm{Br} \stackrel{\text { dryether }}{\longrightarrow}$ ?
1 ethane
2 propane
3 butane
4 ethane, propane and butane.
Explanation:
: When two different alkyl halides are heated with sodium metal in the presence of dry ether, a mixture of different alkenes is obtained. This reaction is known as wurtz reaction
AMU-2014
Hydrocarbons
230135
Among the following 1-butane (I), cis-2butene (II), Trans-2-butene (III), the decreasing order of stability is
1 II $>$ I $>$ III
2 III $>$ II $>$ I
3 II $>$ III $>$ I
4 I $>$ III $>$ II
Explanation:
: Heat of Hydrogenation shows that greater the no. of alkyl group attached to the double bonded carbon atoms, greater is the stability (i.e., Lower is the heat of Hydrogenation) of the alkene. Relative stability of these alkenes follows the sequence $:-$ III $>$ II $>$ I Trans-but-2-ene (III) is more stable than cis-but-2-ene (II) in which the two methyl group are close together and hence then electronic clouds repel each other.
AMU -2008
Hydrocarbons
230137
Which of the following compounds will be formed as a major product on treatment of 2 bromobutane with ethenolic $\mathrm{KOH}$ ?
1
2
3
4
Explanation:
According to Saytzeff's rule, during the dehydrohalogenation of secondary and tertiary haloalkanes, the hydrogen atom is preferentially eliminated from the adjacent carbon atom with lesser number of hydrogen atoms.
AMU-2006
Hydrocarbons
230140
Ethylmagnesium iodide reacts with propylamine to give
1 propane
2 ethyl alcohol
3 ethane
4 ethene
Explanation:
: When ethyl magnesium iodide react with propylamine in presence of $\mathrm{HBr}$ to give ethane.
