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 Multiple Choice QuestionsMultiple Choice Questions

1.

Which of the following has the highest dipolemoment ?

  • (H)2-C=O

  • (CH3)2-C=C-(H)2

  • CH3-CH=CH-CH3

  • CH3-C(Cl)=C(Cl)-CH3


A.

(H)2-C=O

(H)2-C=O

The electronegative oxygen atom is a strong electronwithdrawing group. So there is polarity in the carbonylcompounds. This polarity is even greater than in theasymmetric alkene.


2.

When calcium acetate is distilled, it will produce which of the following compound?

  • CH3COOH

  • CH3CHO

  • CH3COCH3

  • All of these


C.

CH3COCH3

Calcium acetate on distillation produce acetone. It can be explained using the following reaction:

Ca(CH3COO)2CalciumacetateDistillationCH3COCH3Acetone+CaCO3


3.

What is the correct IUPAC name of :

  • 4 - methoxy - 2 - nitrobenzaldehyde

  • 4 - formyl - 3 - nitro anisole

  • 4 - methoxy - 6 - nitrobenzaldehyde

  • 2 - formyl - 5 - methoxy nitrobenzene


A.

4 - methoxy - 2 - nitrobenzaldehyde

The correct IUPAC name of given compound is 4 - methoxy - 2 - nitrobenzaldehyde .


4.

Vinegar contains

  • 100% acetic acid

  • 10- 20% acetic acid

  • 7 - 8% acetic acid

  • 1% acetic acid


C.

7 - 8% acetic acid

Vinegaris an aqueous solution of acetic acid and trace chemicals that may include flavorings. It consists of 7 to 8% acetic acid.


5.

CH3COCH3car be converted to CH3CH2CH3 by the action of :

  • HIO3

  • HNO3

  • HI

  • H3PO3


C.

HI

CH3COCH3can be converted to CH3CH2CH3by reduction process in which the ketone is heatedwith hydroiodic acid and red phosphorus.

CH3COCH3 + HIPCH3CH2CH3


6.

The intermediate formed in aldolcondensation is :

  • aldol

  • carbanion

  • alcohol

  • alpha-hydrogen ester


B.

carbanion

Aldo! condensation :when a carbonylcompound containingα -hydrogen is treated with abase, first of all carbanion is formed.

e.g. CH3CHONaOHOHCH2--CHO

CH3-CH(OH)-CH2-CHO


7.

Propionic acid and KOH reacts to produce which one of the following?

  • Potassium propionate

  • Propyl alcohol

  • Propionaldehyde

  • Does not react


A.

Potassium propionate

Propionic acid and KOH reacts to produce potassium propionate.

CH3CH2COOHPropionicacidKOHCH3CH2COOKPotassiumpropionate+H2O


8.

The compound most suitable for the preparationof cyanohydrin is :

  • C2H5COOH

  • C6H5NH2

  • C2H5COC2H5

  • C2H5-C2H5


C.

C2H5COC2H5

Cyanohydrin can be prepared easily by thereaction of HCN with carbonyl compounds (i.e.Ketones)

(C2H5)2-C=OHCN(C2H5)2-(CN)C(OH) (Cyanohydrin)


9.

The reaction ,

CH3-CO-OCH3 + C2H5OHH+orOH-CH3-CO-OC2H5 + CH3OHis called :

  • Perkin's reaction

  • Claisen Schmidt reaction

  • Esterification

  • Trans-esterification


D.

Trans-esterification

The substitution of alkoxy group of esterby an alcohol ,is calledtrans-esterification .It occurs in presenceof either an acid or base .


10.

The reaction ,

2CH3-CO-OC2H5C2H5ONaCH3-CO-CH2-CO-OC2H5 + C2H5OHis called :

  • Etard reaction

  • Perkin's reaction

  • Claisen condensation

  • Claisen Schmidt reaction


C.

Claisen condensation

2 molecules of ester condense to giveβ- keto ester ,in presence of alkali .Thisreaction is called Claisen condensation .

2CH3-CO-OC2H5C2H5ONaCH3-CO-CH2-CO-OC2H5ethylacetoacetate+ C2H5OH