Chemistry
General
Easy

Question

Amides may be converted into amines by reaction named after:

  1. Perkin 
  2. Claisen
  3. Hofmann
  4. Kekule

The correct answer is: Hofmann

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Carboxylic acids dissolve in  NaOH because the acids undergo:

Carboxylic acids dissolve in  NaOH because the acids undergo:

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0.20 g of a hydrocarbon on combustion gave 0.66 g CO2 .The percentage of hydrogen in the hydrocarbon is about :

0.20 g of a hydrocarbon on combustion gave 0.66 g CO2 .The percentage of hydrogen in the hydrocarbon is about :

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Match the columns.

Column I

Column II

A)
 H subscript 2 left parenthesis g right parenthesis plus I subscript 2 left parenthesis g right parenthesis not stretchy rightwards harpoon over leftwards harpoon 2 HI left parenthesis g right parenthesis P)
Unaffected by inert gas addition
B)
 CaCO subscript 3 left parenthesis s right parenthesis not stretchy rightwards harpoon over leftwards harpoon CaO left parenthesis s right parenthesis plus CO subscript 2 left parenthesis g right parenthesis Q)
Forward shift by rise in pressure and backward shift by inert gas
addition.
C)
 N subscript 2 left parenthesis g right parenthesis plus 3 H subscript 2 left parenthesis g right parenthesis not stretchy rightwards harpoon over leftwards harpoon 2 NH subscript 3 left parenthesis g right parenthesis R)
Unaffected by increase in pressure.
D)
 PCl subscript 5 left parenthesis g right parenthesis not stretchy rightwards harpoon over leftwards harpoon PCl subscript 3 left parenthesis g right parenthesis plus Cl subscript 2 left parenthesis g right parenthesis S)
Backward shift by rise in pressure and forward shift by inert gas addition.

Match the columns.

Column I

Column II

A)
 H subscript 2 left parenthesis g right parenthesis plus I subscript 2 left parenthesis g right parenthesis not stretchy rightwards harpoon over leftwards harpoon 2 HI left parenthesis g right parenthesis P)
Unaffected by inert gas addition
B)
 CaCO subscript 3 left parenthesis s right parenthesis not stretchy rightwards harpoon over leftwards harpoon CaO left parenthesis s right parenthesis plus CO subscript 2 left parenthesis g right parenthesis Q)
Forward shift by rise in pressure and backward shift by inert gas
addition.
C)
 N subscript 2 left parenthesis g right parenthesis plus 3 H subscript 2 left parenthesis g right parenthesis not stretchy rightwards harpoon over leftwards harpoon 2 NH subscript 3 left parenthesis g right parenthesis R)
Unaffected by increase in pressure.
D)
 PCl subscript 5 left parenthesis g right parenthesis not stretchy rightwards harpoon over leftwards harpoon PCl subscript 3 left parenthesis g right parenthesis plus Cl subscript 2 left parenthesis g right parenthesis S)
Backward shift by rise in pressure and forward shift by inert gas addition.

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Chemistry

In Gattermann Koch reactionthe product formed is

In Gattermann Koch reactionthe product formed is

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Which one of the following has no stereogenic center?

Which one of the following has no stereogenic center?

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straight A space steel space ball space of space mass space 2 straight m space suffers space one minus dimensional space elastic space collision space with space straight a space row space of space three space steel space balls comma
space each space of space mass space straight m. space If space mass space 2 straight m space has space collided space with space velocity space straight v space and space the space three space balls space numbered space
1 comma 2 comma 3 space were space initially space at space rest comma space then space after space the space collision

straight A space steel space ball space of space mass space 2 straight m space suffers space one minus dimensional space elastic space collision space with space straight a space row space of space three space steel space balls comma
space each space of space mass space straight m. space If space mass space 2 straight m space has space collided space with space velocity space straight v space and space the space three space balls space numbered space
1 comma 2 comma 3 space were space initially space at space rest comma space then space after space the space collision

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straight A space body space of space mass space 2 space kg space moving space with space straight a space velocity space 3 space straight m divided by straight s space collides space with space straight a space body space of space mass space 1 space kg space moving space
with space straight a space velocity space of space 4 space straight m divided by straight s space in space opposite space direction. space If space the space collision space is space head space on space and space completely space
inelastic comma space then

straight A space body space of space mass space 2 space kg space moving space with space straight a space velocity space 3 space straight m divided by straight s space collides space with space straight a space body space of space mass space 1 space kg space moving space
with space straight a space velocity space of space 4 space straight m divided by straight s space in space opposite space direction. space If space the space collision space is space head space on space and space completely space
inelastic comma space then

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straight A space particle space straight A space suffers space an space oblique space elastic space collision space with space straight a space particle space straight B space that space is space at space rest space initially.
space If space their space masses space are space the space same comma space then space after space the space collision

straight A space particle space straight A space suffers space an space oblique space elastic space collision space with space straight a space particle space straight B space that space is space at space rest space initially.
space If space their space masses space are space the space same comma space then space after space the space collision

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straight A space body space moving space towards space straight a space body space of space finite space mass space at space rest space collides space with space it. space It space is space possible space that

straight A space body space moving space towards space straight a space body space of space finite space mass space at space rest space collides space with space it. space It space is space possible space that

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In space an space elastic space collision space between space two space particles

In space an space elastic space collision space between space two space particles

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An space ideal space spring space is space permanently space connected space between space two space blocks space of space masses space straight M space and space straight m. space The space
blocks minus spring space system space can space move space over space straight a space smooth space horizontal space table space along space straight a space straight space line space along space the space
length space of space the space spring space as space shown space in space figure. space The space blocks space are space brought space nearer space to space compress space the space spring space
and space then space released. space In space the space subsequent space motion

An space ideal space spring space is space permanently space connected space between space two space blocks space of space masses space straight M space and space straight m. space The space
blocks minus spring space system space can space move space over space straight a space smooth space horizontal space table space along space straight a space straight space line space along space the space
length space of space the space spring space as space shown space in space figure. space The space blocks space are space brought space nearer space to space compress space the space spring space
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Two space particles space of space masses space straight m space and space 2 straight m space move space with space acceleration space 2 a i with hat on top italic space text  and  end text minus a i with italic hat on top italic space r e s p e c t i v e l y italic colon

Two space particles space of space masses space straight m space and space 2 straight m space move space with space acceleration space 2 a i with hat on top italic space text  and  end text minus a i with italic hat on top italic space r e s p e c t i v e l y italic colon

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straight A space ball space of space mass space 1 space kg space is space thrown space up space with space an space initial space speed space of space 4 space straight m divided by straight s. space straight A space second space ball space of space mass space 2 space kg space is space
released space from space rest space from space some space height space as space shown space in space figure. space Choose space the space correct space statement left parenthesis straight s right parenthesis.

straight A space ball space of space mass space 1 space kg space is space thrown space up space with space an space initial space speed space of space 4 space straight m divided by straight s. space straight A space second space ball space of space mass space 2 space kg space is space
released space from space rest space from space some space height space as space shown space in space figure. space Choose space the space correct space statement left parenthesis straight s right parenthesis.

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