Q&A - Ask Doubts and Get Answers

Sort by :
Clear All
Q
Engineering
95 Views   |  

3 moles of ethanol react with 1 mole of PBr_{3} to form 3 mole of bromoethane and one mole of x . which of the following is x

  • Option 1)

    H_{3}PO_{4}

  • Option 2)

    H_{3}PO_{2}

  • Option 3)

    HPO_{3}

  • Option 4)

    H_{3}PO_{3}

 
As we learnt in  Alcohols reaction with phosphorus trihalides - Form alkyl halides  - wherein X = Cl, Br, I     Option 1) This option is incorrect. Option 2) This option is incorrect. Option 3) This option is incorrect. Option 4) This option is correct.
Engineering
113 Views   |  

Propene\xrightarrow[778K]{Cl_{2}} \times \xrightarrow[Alc.]{NH_{3}}Y(major)

The product (Y) is:

  • Option 1)

    Allylamine

  • Option 2)

    n-propylamine

  • Option 3)

    1,2-diaminopropane

  • Option 4)

    1,2-diaminopropane

 
As we learnt in Primary Amines - Replacement of one H atom of ammonia by one alkyl and or aryl radicals yield primary or   amines. - wherein                                                                                                                      Option 1) Allylamine This option is correct Option 2) n-propylamine This option is incorrect Option 3) 1,2-diaminopropane This option is...
Engineering
146 Views   |  

C_{2}H_{5}CHO\ and\ CH_{3} COCH_{3}  can be distinguished by testing with

  • Option 1)

    Phenyl hydrazine

  • Option 2)

    Hydroxyl Amine

  • Option 3)

    Fehlings's solution

  • Option 4)

    Sodium Bisulphate

 
As we learnt in Oxidation of aldehydes with Fehling's solution - –  Fehling solution A is aqueous copper sulphate, Fehling solution B is alkaline sodium potassium tartrate (Rochelle salts) –  Distinguished aldehydes from ketones. - wherein    Fehling's solution can be used to distinguish aldehydes (C2H5CHO) and ketones (CH3COCH3). Option 1) Phenyl hydrazine This option is incorrect Option...
Engineering
96 Views   |  

(CH_{3})_{3} C=CHCOOH\overset{A}{\rightarrow}C(H_{3})_2=CHCH_{2}OH The reagent A is

  • Option 1)

    H_{2}/Ni

  • Option 2)

    B_{2}H_{6}

  • Option 3)

    LiAlH_{4}/ether

  • Option 4)

    H_2-Pd/BaSO_4

 
As we learnt in Alcohol formation by reduction of carboxylic acids - Yields primary alcohol. - wherein    A is LiAlH4 Option 1) This option is incorrect Option 2) This option is incorrect Option 3) This option is correct Option 4) This option is incorrect
Engineering
98 Views   |  

Y in the above sequence is

  • Option 1)

    Ethylamine

  • Option 2)

    Methylamine

  • Option 3)

    Acetonitrile

  • Option 4)

    Ammonium Acetate

 
As we learnt in Method of preparation of cyanide from amides - By dehydration of acid amides with P2O5. - wherein    and From Amides - Reduction of amides produces corresponding amines with same number of carbon atoms. - wherein   Option 1) Ethylamine This option is correct Option 2) Methylamine This option is incorrect Option 3) Acetonitrile This option is incorrect Option 4) Ammonium...
Engineering
98 Views   |  

A will be

  • Option 1)

  • Option 2)

  • Option 3)

  • Option 4)

    All of these

 
As learnt in Reaction of secondary amine with HNO2 - Secondary amine produces N - Nitrosoamine. - wherein       A is N-nitroso-N-methylaniline Option 1) This option is incorrect Option 2) This option is incorrect Option 3) This option is correct Option 4) All of these This option is incorrect
Engineering
112 Views   |  

Which of the following is the strongest acid?

  • Option 1)

    HCOOH\:(pka=3.77)

  • Option 2)

    C_{6}H_{5}COOH\:(pka=4.22)

  • Option 3)

    CH_{3}COOH\:(pka=4.71)

  • Option 4)

    CH_{3}CH_{2}COOH\:(pka=4.88)

 
As we learnt in Basic strength and Kb and pKb values - Basic strength is directly proportional to Kb values and inversely proportional to pKb values. -     Acidic strength is inversely proportional to pKa values therefore, HCOOH is the strongest acid. Option 1) Option is Correct Option 2) Option is incorrect Option 3) Option is incorrect Option 4) Option is incorrect
Engineering
220 Views   |  

How much bromine needed to produce tribromophenol from phenol?

  • Option 1)

    1.5 mol

  • Option 2)

    4.5 mol

  • Option 3)

    3.0 mol

  • Option 4)

    6.0 mol

 
As we learnt in Halogenation when Heated with bromine water - While precipitate of  2, 4, 6 - tribromophenol is formed. - wherein       Option 1) 1.5 mol Incorrect Option 2) 4.5 mol Incorrect Option 3) 3.0 mol Correct Option 4) 6.0 mol Incorrect
Exams
Articles
Questions