NEETprep Bank NEET Chemistry Differentiations & Conversions - Organic Chemistry Questions Solved


A compound A of formula C3H6Cl2 on reaction with alkali can give B of formula C3H6O or C of formula C3H4. B on oxidation gave a compound of the formula C3H6O. C with dilute H2SO4 containing Hg2+ ion gave D of formula C3H6O, which with bromine and NaOH gave the sodium salt of C2H4O2. Then A is :

(a) CH3CH2CHCl2

(b) CH3CCl2CH3

(c) CH2ClCH2CH2Cl

(d) CH3CHClCH2Cl

 

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#13 | Conversion: Acid Derivative to Triple Bond (n to n)

Concept Questions :-

conversion chart for n to n carbon
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Identify the product (A) in following reaction series, CH3CNNa/C2H5OH(X)HNO2(Y)O(Z)Tollens reagent(A) :

(a) CH3CHO

(b) CH3CONH2

(c) CH3COOH

(d) CH- CH2-NHOH

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#13 | Conversion: Acid Derivative to Triple Bond (n to n)

Concept Questions :-

conversion chart for n to n carbon
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Vapour density of an organic compound is 23.0. It contains 52.17% of carbon and 13% of hydrogen. The compound gives iodoform test. The compound is:

(a) ethanol                               

(b) dimethyl ether

(c) acetone                             

(d) methanal

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#2 | Differentiation: Iodoform Reaction

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Iodoform Reaction
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Compound (A), C8H9Br , gives a white precipitate when warmed with alcholic AgNO3. Oxidation of (A) gives an acid (B), C8H6O4. (B) easily forms anhydride on heating. Identify the compound (A).

(a)

 

(b)

 

(c)

 

(d)

 

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#19 | Conversion: Solved Problems on Aromatics: 1
#20 | Conversion: Solved Problems on Aromatics: 2
#21 | Conversion: Solved Problems on Aromatics: 3

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Aromatic Conversion
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Which of the following will give yellow precipitate with I2/NaOH?

1. CH3-CO-O-CO-CH3

4.Both (2) and (3)

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#2 | Differentiation: Iodoform Reaction

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Iodoform Reaction
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A nitrogeneous substance X is treated with red P/I2,AgNO2, HNO2 and the product so formed is further treated with NaOH solution, which produces blue colouration. X can be

1. CH3CH2NH2       R   R'  R"  C  OH  Red P+I2     I      AgNO2     NO2

2 CH3CH2NO2

3. CH3CH2ONO

4 (CH3)2CHNO2

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#3 | Differentiation: 1st, 2nd & 3rd Degree Alcohol

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1st, 2nd & 3rd Degree Alcohol
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The compound which reacts fastest with Lucas reagent at room temperature is:
1. Butan-1-ol
2. Butan-2-ol
3. 2-methylpropan-1-ol
4. 2-methylpropan-2-ol

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#3 | Differentiation: 1st, 2nd & 3rd Degree Alcohol

Concept Questions :-

1st, 2nd & 3rd Degree Alcohol
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Methanol and ethanol can be distinguished by the following:
1. By reaction with metallic sodium
2. By reaction with caustic soda
3. By heating with iodine and washing soda
4. By heating with zinc and inorganic mineral acid

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#6 | Differentiation: Alcohols & Phenols

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Alcohols & Phenols
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Identify (X) in the sequence :

C3H8O  (X) H2SO4K2Cr2O7 C3H6O WarmI2 +NaOH CHI3

(1) CH3-CH2-CH2OH

(2) 

(3) CH3-O-CH2-CH3

(4) CH3-CH2-CHO

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#2 | Differentiation: Iodoform Reaction

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Iodoform Reaction
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In order to accomplish the following conversion, what reagent and conditions would be required?

1. Cold sodium hydroxide

2. Hot conc. sodium hydroxide

3. Potassium tertiary butoxide and heat

4. Hot water

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#13 | Conversion: Acid Derivative to Triple Bond (n to n)

Concept Questions :-

conversion chart for n to n carbon
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