230113
What hapens when chloroform is left open in air in the presence of sunlight?
1 Polymerisation takes place
2 Explosion takes place
3 No reaction takes place
4 Phosgene, a poisonous gas is formed
Explanation:
Chloroform in the presence of sunlight and air undergoes reaction with oxygen and form a poisonous phosgene gas.
AIIMS-1996
Hydrocarbons
230117
Which of the following would not give 2phenylbutane as the major product in a Friedel-Craft's alkylation reaction of benzene?
1 1-butene $+\mathrm{HF}$
2 2-butanol $+\mathrm{H}_2 \mathrm{SO}_4$
3 Butanoyl chloride $+\mathrm{AlCl}_3$ then $\mathrm{Zn}, \mathrm{HCl}$
4 Butyl chloride $+\mathrm{AlCl}_3$
Explanation:
The Friedal-Crafts alkylation reaction will give propyl phenyl ketone which further on clemnenson's reduction will give butyl benzene.
AIIMS-2014
Hydrocarbons
230120
The size of $\mathrm{C}-\mathrm{C}$ bond in benzene is
1 $1.22 \dot{A}$
2 $1.54 \AA$
3 $1.39 \AA$
4 $1.56 \AA$
Explanation:
: The structure of benzene is - c1ccccc1 In bond length of $\mathrm{C}-\mathrm{C}$ single bond is ethane $=1.54$ $\AA$ and double bond $(\mathrm{C}=\mathrm{C})$ in ethane is $1.33 \AA$. In benzene carbon carbon bond length has $1.39 \mathrm{~A}$ which lies between the single and double bond length value.
AIIMS-2002
Hydrocarbons
230127
Hydrolysis of an ester gives a carboxylic acid which on Kolbe's electrolysis yields ethane, The ester is :
1 Methyl ethanoate
2 Methyl methanoate
3 Ethyl methanoate
4 Methyl propanoate
Explanation:
: Hydrolysis of methyl ethanoate $\left(\mathrm{CH}_3 \mathrm{COOCH}_3\right)$ gives acetic acid $\left(\mathrm{CH}_3 \mathrm{COOH}\right)$ and methyl alcohol $\left(\mathrm{CH}_3 \mathrm{OH}\right)$. Acetic acid on electrolysis by Kolbe's method gives ethane. Thus, the ester will be methyl ethanoate $\left(\mathrm{CH}_3 \mathrm{COOCH}_3\right)$. $\mathrm{CH}_3 \mathrm{COOCH}_3+\longrightarrow \mathrm{CH}_3 \mathrm{COOH}+\mathrm{CH}_3 \mathrm{OH}$ Methyl ethanoate Acetic acid Methanol In Kolbe's electrolysis, ethane is formed in anode and $\mathrm{H}_2$ gas librated at cathode. At anode :-
AP - EAMCET - (Medical)-1997
Hydrocarbons
230130
Which of the following reactions is used to prepare isobutane?
1 Wurtz reaction of $\mathrm{C}_2 \mathrm{H}_5 \mathrm{Br}$
2 Hydrolysis of n-butylmagnesium iodide
3 Reduction of propanol with red phosphorus and $\mathrm{HI}$
4 Decarboxylation of 3-methylbutanoic acid
Explanation:
: 3-methylbutanoic acid gives isobutane on decarboxylation.
230113
What hapens when chloroform is left open in air in the presence of sunlight?
1 Polymerisation takes place
2 Explosion takes place
3 No reaction takes place
4 Phosgene, a poisonous gas is formed
Explanation:
Chloroform in the presence of sunlight and air undergoes reaction with oxygen and form a poisonous phosgene gas.
AIIMS-1996
Hydrocarbons
230117
Which of the following would not give 2phenylbutane as the major product in a Friedel-Craft's alkylation reaction of benzene?
1 1-butene $+\mathrm{HF}$
2 2-butanol $+\mathrm{H}_2 \mathrm{SO}_4$
3 Butanoyl chloride $+\mathrm{AlCl}_3$ then $\mathrm{Zn}, \mathrm{HCl}$
4 Butyl chloride $+\mathrm{AlCl}_3$
Explanation:
The Friedal-Crafts alkylation reaction will give propyl phenyl ketone which further on clemnenson's reduction will give butyl benzene.
AIIMS-2014
Hydrocarbons
230120
The size of $\mathrm{C}-\mathrm{C}$ bond in benzene is
1 $1.22 \dot{A}$
2 $1.54 \AA$
3 $1.39 \AA$
4 $1.56 \AA$
Explanation:
: The structure of benzene is - c1ccccc1 In bond length of $\mathrm{C}-\mathrm{C}$ single bond is ethane $=1.54$ $\AA$ and double bond $(\mathrm{C}=\mathrm{C})$ in ethane is $1.33 \AA$. In benzene carbon carbon bond length has $1.39 \mathrm{~A}$ which lies between the single and double bond length value.
AIIMS-2002
Hydrocarbons
230127
Hydrolysis of an ester gives a carboxylic acid which on Kolbe's electrolysis yields ethane, The ester is :
1 Methyl ethanoate
2 Methyl methanoate
3 Ethyl methanoate
4 Methyl propanoate
Explanation:
: Hydrolysis of methyl ethanoate $\left(\mathrm{CH}_3 \mathrm{COOCH}_3\right)$ gives acetic acid $\left(\mathrm{CH}_3 \mathrm{COOH}\right)$ and methyl alcohol $\left(\mathrm{CH}_3 \mathrm{OH}\right)$. Acetic acid on electrolysis by Kolbe's method gives ethane. Thus, the ester will be methyl ethanoate $\left(\mathrm{CH}_3 \mathrm{COOCH}_3\right)$. $\mathrm{CH}_3 \mathrm{COOCH}_3+\longrightarrow \mathrm{CH}_3 \mathrm{COOH}+\mathrm{CH}_3 \mathrm{OH}$ Methyl ethanoate Acetic acid Methanol In Kolbe's electrolysis, ethane is formed in anode and $\mathrm{H}_2$ gas librated at cathode. At anode :-
AP - EAMCET - (Medical)-1997
Hydrocarbons
230130
Which of the following reactions is used to prepare isobutane?
1 Wurtz reaction of $\mathrm{C}_2 \mathrm{H}_5 \mathrm{Br}$
2 Hydrolysis of n-butylmagnesium iodide
3 Reduction of propanol with red phosphorus and $\mathrm{HI}$
4 Decarboxylation of 3-methylbutanoic acid
Explanation:
: 3-methylbutanoic acid gives isobutane on decarboxylation.
230113
What hapens when chloroform is left open in air in the presence of sunlight?
1 Polymerisation takes place
2 Explosion takes place
3 No reaction takes place
4 Phosgene, a poisonous gas is formed
Explanation:
Chloroform in the presence of sunlight and air undergoes reaction with oxygen and form a poisonous phosgene gas.
AIIMS-1996
Hydrocarbons
230117
Which of the following would not give 2phenylbutane as the major product in a Friedel-Craft's alkylation reaction of benzene?
1 1-butene $+\mathrm{HF}$
2 2-butanol $+\mathrm{H}_2 \mathrm{SO}_4$
3 Butanoyl chloride $+\mathrm{AlCl}_3$ then $\mathrm{Zn}, \mathrm{HCl}$
4 Butyl chloride $+\mathrm{AlCl}_3$
Explanation:
The Friedal-Crafts alkylation reaction will give propyl phenyl ketone which further on clemnenson's reduction will give butyl benzene.
AIIMS-2014
Hydrocarbons
230120
The size of $\mathrm{C}-\mathrm{C}$ bond in benzene is
1 $1.22 \dot{A}$
2 $1.54 \AA$
3 $1.39 \AA$
4 $1.56 \AA$
Explanation:
: The structure of benzene is - c1ccccc1 In bond length of $\mathrm{C}-\mathrm{C}$ single bond is ethane $=1.54$ $\AA$ and double bond $(\mathrm{C}=\mathrm{C})$ in ethane is $1.33 \AA$. In benzene carbon carbon bond length has $1.39 \mathrm{~A}$ which lies between the single and double bond length value.
AIIMS-2002
Hydrocarbons
230127
Hydrolysis of an ester gives a carboxylic acid which on Kolbe's electrolysis yields ethane, The ester is :
1 Methyl ethanoate
2 Methyl methanoate
3 Ethyl methanoate
4 Methyl propanoate
Explanation:
: Hydrolysis of methyl ethanoate $\left(\mathrm{CH}_3 \mathrm{COOCH}_3\right)$ gives acetic acid $\left(\mathrm{CH}_3 \mathrm{COOH}\right)$ and methyl alcohol $\left(\mathrm{CH}_3 \mathrm{OH}\right)$. Acetic acid on electrolysis by Kolbe's method gives ethane. Thus, the ester will be methyl ethanoate $\left(\mathrm{CH}_3 \mathrm{COOCH}_3\right)$. $\mathrm{CH}_3 \mathrm{COOCH}_3+\longrightarrow \mathrm{CH}_3 \mathrm{COOH}+\mathrm{CH}_3 \mathrm{OH}$ Methyl ethanoate Acetic acid Methanol In Kolbe's electrolysis, ethane is formed in anode and $\mathrm{H}_2$ gas librated at cathode. At anode :-
AP - EAMCET - (Medical)-1997
Hydrocarbons
230130
Which of the following reactions is used to prepare isobutane?
1 Wurtz reaction of $\mathrm{C}_2 \mathrm{H}_5 \mathrm{Br}$
2 Hydrolysis of n-butylmagnesium iodide
3 Reduction of propanol with red phosphorus and $\mathrm{HI}$
4 Decarboxylation of 3-methylbutanoic acid
Explanation:
: 3-methylbutanoic acid gives isobutane on decarboxylation.
230113
What hapens when chloroform is left open in air in the presence of sunlight?
1 Polymerisation takes place
2 Explosion takes place
3 No reaction takes place
4 Phosgene, a poisonous gas is formed
Explanation:
Chloroform in the presence of sunlight and air undergoes reaction with oxygen and form a poisonous phosgene gas.
AIIMS-1996
Hydrocarbons
230117
Which of the following would not give 2phenylbutane as the major product in a Friedel-Craft's alkylation reaction of benzene?
1 1-butene $+\mathrm{HF}$
2 2-butanol $+\mathrm{H}_2 \mathrm{SO}_4$
3 Butanoyl chloride $+\mathrm{AlCl}_3$ then $\mathrm{Zn}, \mathrm{HCl}$
4 Butyl chloride $+\mathrm{AlCl}_3$
Explanation:
The Friedal-Crafts alkylation reaction will give propyl phenyl ketone which further on clemnenson's reduction will give butyl benzene.
AIIMS-2014
Hydrocarbons
230120
The size of $\mathrm{C}-\mathrm{C}$ bond in benzene is
1 $1.22 \dot{A}$
2 $1.54 \AA$
3 $1.39 \AA$
4 $1.56 \AA$
Explanation:
: The structure of benzene is - c1ccccc1 In bond length of $\mathrm{C}-\mathrm{C}$ single bond is ethane $=1.54$ $\AA$ and double bond $(\mathrm{C}=\mathrm{C})$ in ethane is $1.33 \AA$. In benzene carbon carbon bond length has $1.39 \mathrm{~A}$ which lies between the single and double bond length value.
AIIMS-2002
Hydrocarbons
230127
Hydrolysis of an ester gives a carboxylic acid which on Kolbe's electrolysis yields ethane, The ester is :
1 Methyl ethanoate
2 Methyl methanoate
3 Ethyl methanoate
4 Methyl propanoate
Explanation:
: Hydrolysis of methyl ethanoate $\left(\mathrm{CH}_3 \mathrm{COOCH}_3\right)$ gives acetic acid $\left(\mathrm{CH}_3 \mathrm{COOH}\right)$ and methyl alcohol $\left(\mathrm{CH}_3 \mathrm{OH}\right)$. Acetic acid on electrolysis by Kolbe's method gives ethane. Thus, the ester will be methyl ethanoate $\left(\mathrm{CH}_3 \mathrm{COOCH}_3\right)$. $\mathrm{CH}_3 \mathrm{COOCH}_3+\longrightarrow \mathrm{CH}_3 \mathrm{COOH}+\mathrm{CH}_3 \mathrm{OH}$ Methyl ethanoate Acetic acid Methanol In Kolbe's electrolysis, ethane is formed in anode and $\mathrm{H}_2$ gas librated at cathode. At anode :-
AP - EAMCET - (Medical)-1997
Hydrocarbons
230130
Which of the following reactions is used to prepare isobutane?
1 Wurtz reaction of $\mathrm{C}_2 \mathrm{H}_5 \mathrm{Br}$
2 Hydrolysis of n-butylmagnesium iodide
3 Reduction of propanol with red phosphorus and $\mathrm{HI}$
4 Decarboxylation of 3-methylbutanoic acid
Explanation:
: 3-methylbutanoic acid gives isobutane on decarboxylation.
230113
What hapens when chloroform is left open in air in the presence of sunlight?
1 Polymerisation takes place
2 Explosion takes place
3 No reaction takes place
4 Phosgene, a poisonous gas is formed
Explanation:
Chloroform in the presence of sunlight and air undergoes reaction with oxygen and form a poisonous phosgene gas.
AIIMS-1996
Hydrocarbons
230117
Which of the following would not give 2phenylbutane as the major product in a Friedel-Craft's alkylation reaction of benzene?
1 1-butene $+\mathrm{HF}$
2 2-butanol $+\mathrm{H}_2 \mathrm{SO}_4$
3 Butanoyl chloride $+\mathrm{AlCl}_3$ then $\mathrm{Zn}, \mathrm{HCl}$
4 Butyl chloride $+\mathrm{AlCl}_3$
Explanation:
The Friedal-Crafts alkylation reaction will give propyl phenyl ketone which further on clemnenson's reduction will give butyl benzene.
AIIMS-2014
Hydrocarbons
230120
The size of $\mathrm{C}-\mathrm{C}$ bond in benzene is
1 $1.22 \dot{A}$
2 $1.54 \AA$
3 $1.39 \AA$
4 $1.56 \AA$
Explanation:
: The structure of benzene is - c1ccccc1 In bond length of $\mathrm{C}-\mathrm{C}$ single bond is ethane $=1.54$ $\AA$ and double bond $(\mathrm{C}=\mathrm{C})$ in ethane is $1.33 \AA$. In benzene carbon carbon bond length has $1.39 \mathrm{~A}$ which lies between the single and double bond length value.
AIIMS-2002
Hydrocarbons
230127
Hydrolysis of an ester gives a carboxylic acid which on Kolbe's electrolysis yields ethane, The ester is :
1 Methyl ethanoate
2 Methyl methanoate
3 Ethyl methanoate
4 Methyl propanoate
Explanation:
: Hydrolysis of methyl ethanoate $\left(\mathrm{CH}_3 \mathrm{COOCH}_3\right)$ gives acetic acid $\left(\mathrm{CH}_3 \mathrm{COOH}\right)$ and methyl alcohol $\left(\mathrm{CH}_3 \mathrm{OH}\right)$. Acetic acid on electrolysis by Kolbe's method gives ethane. Thus, the ester will be methyl ethanoate $\left(\mathrm{CH}_3 \mathrm{COOCH}_3\right)$. $\mathrm{CH}_3 \mathrm{COOCH}_3+\longrightarrow \mathrm{CH}_3 \mathrm{COOH}+\mathrm{CH}_3 \mathrm{OH}$ Methyl ethanoate Acetic acid Methanol In Kolbe's electrolysis, ethane is formed in anode and $\mathrm{H}_2$ gas librated at cathode. At anode :-
AP - EAMCET - (Medical)-1997
Hydrocarbons
230130
Which of the following reactions is used to prepare isobutane?
1 Wurtz reaction of $\mathrm{C}_2 \mathrm{H}_5 \mathrm{Br}$
2 Hydrolysis of n-butylmagnesium iodide
3 Reduction of propanol with red phosphorus and $\mathrm{HI}$
4 Decarboxylation of 3-methylbutanoic acid
Explanation:
: 3-methylbutanoic acid gives isobutane on decarboxylation.
