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Chemistry-

General

Easy

Question

The following reaction is known as

Perkin reaction
Gattermann reaction
Kolbe reaction
Gattermann-aldehyde reaction

The correct answer is: Gattermann-aldehyde reaction

In the presence of anhydrous $Z n C l subscript 2 comma$ phenol form salicyladehyde. It is Gattermann-aldehyde reaction.

Related Questions to study

On heating glycerol with conc. $H subscript 2 S O subscript 4 comma$ a compound is obtained which has bad odour. The compound is:

On heating glycerol with conc. $H subscript 2 S O subscript 4 comma$ a compound is obtained which has bad odour. The compound is:

chemistry-General

On conversion into the Grignard reagent followed by treatment with absolute ethanol, how many isomeric alkyl chlorides would yield 2-methylbutane?

R H space i s space left parenthesis C H subscript 3 right parenthesis subscript 2 space C H bullet C H subscript 2 space C H subscript 3

On conversion into the Grignard reagent followed by treatment with absolute ethanol, how many isomeric alkyl chlorides would yield 2-methylbutane?

chemistry-General

R H space i s space left parenthesis C H subscript 3 right parenthesis subscript 2 space C H bullet C H subscript 2 space C H subscript 3

What is formed when glycerol reacts with excess of HI?

When glycerol reacts with HI

comma space i s o minus p r o p y l space

iodide is obtained

What is formed when glycerol reacts with excess of HI?

chemistry-General

When glycerol reacts with HI

comma space i s o minus p r o p y l space

iodide is obtained

parallel

General formula for alcohols is:

General formula for alcohols is

C subscript n H subscript left parenthesis 2 n plus 1 right parenthesis O H.

Primary alcohols have

negative C H subscript 2 space O H space g p.

Secondary Alcohols have

and tertiary alcohols have

General formula for alcohols is:

chemistry-General

General formula for alcohols is

C subscript n H subscript left parenthesis 2 n plus 1 right parenthesis O H.

Primary alcohols have

negative C H subscript 2 space O H space g p.

Secondary Alcohols have

and tertiary alcohols have

Which of the following compounds is weakest acid?

Electron withdrawing groups (like

– N O subscript 2 right parenthesis

increase the acidity of phenols by stabilising corresponding phenoxide ion. The effect of

– N O subscript 2

group will beminimum at m-position due to lack of increased delocalisation of electrons in it. Hence, m-nitrophenol is the weakest acid among these.

Which of the following compounds is weakest acid?

chemistry-General

Electron withdrawing groups (like

– N O subscript 2 right parenthesis

increase the acidity of phenols by stabilising corresponding phenoxide ion. The effect of

– N O subscript 2

group will beminimum at m-position due to lack of increased delocalisation of electrons in it. Hence, m-nitrophenol is the weakest acid among these.

Assertion :We cannot produce a real image by plane or convex mirrors under any circumstances
Reason : The focal length of a convex mirror is always taken as positive

Assertion :We cannot produce a real image by plane or convex mirrors under any circumstances
Reason : The focal length of a convex mirror is always taken as positive

physics-General

parallel

An organic compound reacts with $P C l subscript 5$ to give. The compound with sodium metal gives $n minus b u tan e. space T h u s comma space A space a n d space B space a r e colon$

An organic compound reacts with $P C l subscript 5$ to give. The compound with sodium metal gives $n minus b u tan e. space T h u s comma space A space a n d space B space a r e colon$

chemistry-General

If f : R → R is continuous and differentiable function such that $not stretchy integral subscript negative 1 end subscript superscript x end superscript blank$ f(t) dt + f¢¢¢ (3) $not stretchy integral subscript x end subscript superscript 0 end superscript d t equals not stretchy integral subscript 1 end subscript superscript x end superscript blank$ t³
dt – f ¢ (1) $not stretchy integral subscript 0 end subscript superscript x end superscript blank$ t² dt + f ¢¢ (2) $not stretchy integral subscript x end subscript superscript 3 end superscript blank$ t. dt, then the value of f ¢ (4) is :

If f : R → R is continuous and differentiable function such that $not stretchy integral subscript negative 1 end subscript superscript x end superscript blank$ f(t) dt + f¢¢¢ (3) $not stretchy integral subscript x end subscript superscript 0 end superscript d t equals not stretchy integral subscript 1 end subscript superscript x end superscript blank$ t³
dt – f ¢ (1) $not stretchy integral subscript 0 end subscript superscript x end superscript blank$ t² dt + f ¢¢ (2) $not stretchy integral subscript x end subscript superscript 3 end superscript blank$ t. dt, then the value of f ¢ (4) is :

Assertion : The refractive index of diamond is $square root of 6$ and that of liquid is $square root of 3$
If the light travels from diamond to the liquid, it will totally reflected when the angle of incidence is 30^o
Reason : $mu equals fraction numerator 1 over denominator sin invisible function application C end fraction$ where $mu$ is the refractive index of diamond with respect to liquid

Assertion : The refractive index of diamond is $square root of 6$ and that of liquid is $square root of 3$
If the light travels from diamond to the liquid, it will totally reflected when the angle of incidence is 30^o
Reason : $mu equals fraction numerator 1 over denominator sin invisible function application C end fraction$ where $mu$ is the refractive index of diamond with respect to liquid

physics-General

parallel

If f : [0, p] → R is continuous and $not stretchy integral subscript 0 end subscript superscript pi end superscript blank$ f(x) sin x dx = $not stretchy integral subscript 0 end subscript superscript pi end superscript blank$ f(x) cos x dx = 0, then the number of roots of f(x) in (0, p) is

If f : [0, p] → R is continuous and $not stretchy integral subscript 0 end subscript superscript pi end superscript blank$ f(x) sin x dx = $not stretchy integral subscript 0 end subscript superscript pi end superscript blank$ f(x) cos x dx = 0, then the number of roots of f(x) in (0, p) is

Assertion : Different colours travel with different speed in vacuum
Reason : Wavelength of light depends on refractive index of medium

Assertion : Different colours travel with different speed in vacuum
Reason : Wavelength of light depends on refractive index of medium

physics-General

The following substance can be used as a raw material for obtaining alcohol:

The following substance can be used as a raw material for obtaining alcohol:

chemistry-General

parallel

Etherates are

Etherates are complexes of ethers with Lewis acid

Etherates are

chemistry-General

Etherates are complexes of ethers with Lewis acid

$E t h y l space a l c o h o l space r e a c t s space w i t h space H C l space b u t space n o t space w i t h space H C N space b e c a u s e colon$

Weak base reacts with strong acid.

$E t h y l space a l c o h o l space r e a c t s space w i t h space H C l space b u t space n o t space w i t h space H C N space b e c a u s e colon$

chemistry-General

Weak base reacts with strong acid.

Lucas reagent produces cloudiness immediately with:

Reactivity order of towards Lucas reagent is, Tertiary>Secondary>Primary alcohol.

Lucas reagent produces cloudiness immediately with:

chemistry-General

Reactivity order of towards Lucas reagent is, Tertiary>Secondary>Primary alcohol.

parallel

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