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 Multiple Choice QuestionsMultiple Choice Questions

1.

Which one of the following reduced with zinc and hydrochloric acid to give the corresponding hydrocarbon?

  • Ethyl acetate

  • Butan -2-one

  • Acetamide

  • Acetic acid


B.

Butan -2-one

CH subscript 3 minus CH subscript 2 minus CO minus CH subscript 3 space rightwards arrow with Zn space left parenthesis Hg right parenthesis space plus space HCl on top space CH subscript 3 CH subscript 2 CH subscript 2 CH subscript 3
266 Views

2.

Which of the following undergoes reaction with 50% sodium hydroxide solution to give the corresponding alcohol and acid?

  • Phenol

  • Benzoic acid

  • Butanal

  • Benzaldehyde


D.

Benzaldehyde

 A + NaOH  → alcohol  + acid
Thus, it is Cannizzaro reaction
A is thus aldehyde without H at alpha - carbon
(as C6H5CHO.HCHO)
2C6H5CHO + NaOH  → C6H5CH2OH + C6H5COONa

311 Views

3.

The IUPAC name of the compound

  • 3, 3- dimethyl -1- hydroxy cyclohexane

  • 1,1 – dimethyl -3- cyclohexanol

  • 3,3- dimethyl -1- cyclohexanol

  • 1,1 – dimethyl -3- hydroxy cyclohexane


C.

3,3- dimethyl -1- cyclohexanol

343 Views

4.

Fluorobenzene (C6H5F) can be synthesized in the laboratory

  •  by heating phenol with HF and KF

  • from aniline by diazotisation followed by heating the diazonium salt with HBF4

  • by direct fluorination of benzene with F2 gas

  • by reacting bromobenzene with NaF solution 


B.

from aniline by diazotisation followed by heating the diazonium salt with HBF4

658 Views

5.

Acetyl bromide reacts with excess of CH3MgI followed by treatment with a saturated solution of NH4Cl given

  • acetone

  • acetyl iodide

  • 2- methyl -2- propanol

  • acetamide


C.

2- methyl -2- propanol

1197 Views

6.

The reaction



is fastest when X is

  • Cl

  • NH2

  • OC2H5

  • OCOR


A.

Cl

Conjugated acid of Cl- is a stronger acid i.e. HCl.

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7.

Acid catalyzed hydration of alkenes except ethene leads to the formation of

  • primary alcohol

  • secondary or tertiary alcohol

  • mixture of primary and secondary alcohols

  • mixture of secondary and tertiary alcohols


D.

mixture of secondary and tertiary alcohols

302 Views

8.

On mixing ethyl acetate with aqueous sodium chloride, the composition of the resultant solution is

  • CH3COOC2H5 + NaCl

  • CH3Cl + C2H5COONa

  • CH3COCl + C2H5OH + NaOH

  • CH3COONa + C2H5OH


A.

CH3COOC2H5 + NaCl

Aqueous NaCl is neutral hence there is no reaction between ethyl acetate and aqueous NaCl

696 Views

9.

Reaction of one molecule of HBr with one molecule of 1,3-butadiene at 400 C gives predominantly

  • 3-bromobutene under kinetically controlled conditions

  • 1-bromo-2-butene under thermodymically controlled conditions

  • 3-bromobutene under thermodynamically controlled conditions

  • 1-bromo-2-butene under kinetically controlled conditions


B.

1-bromo-2-butene under thermodymically controlled conditions

292 Views

10.

Among the following compound which can be dehydrated very easily is


C.

Dehydration of alcohol is in order 1°  < 2°  < 3°. 

314 Views