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 Multiple Choice QuestionsMultiple Choice Questions

11.

Phenol reacts with aqueous bromine to give :

  •  + 


D.

OH group in phenol ,activates the benzene ring ,hence it easily reacts with bromine water to give tribromo phenol .

 


12.

Phenol and benzoic acid are distinguished by

  • NaOH

  • NaHCO3

  • Na2CO3

  • H2SO4


B.

NaHCO3

Phenol and benzoic acid can be distinguished by NaHCO3 because only stronger acid reacts with sodium bi-carbonate.


13.

The product obtained ,heating ethanol with conc. H2SO4 at 165° - 170°C is :

  • (C2H5)2SO4

  • CH2=CH2

  • CH2F-CH2F

  • CF2=CFCl


B.

CH2=CH2

Ethyl alcohol , on heating at 165° - 170°C with conc. H2SO4 , gives ethylene .

C2H5OH 170°Cconc. H2SO4 CH2=CH2ethylene + H2O


14.

Which of the following will not react with NaOH ?

  • C2H5OH

  • CH3CONH2

  • CH(CN)3


B.

C2H5OH

C2H5OH (ethanol) is a very weak acid , hence it does not react with NaOH .However it reacts with - metallic sodium.


15.

Assertion : Molar entropy of vaporisation of water is different from ethanol.

Reason : Water is more polar than ethanol.

  • If both assertion and reason are true and reason is the correct explanation of assertion.

  • If both assertion and reason are true but reason is not the correct explanation of assertion

  • If assertion is true but reason is false

  • If both assertion and reason are false.


B.

If both assertion and reason are true but reason is not the correct explanation of assertion

Molar entropy of vaporization of water is more than ethanol, as water has greater forces of attraction than ethanol.


16.

Which of the following alcohol is used as beverage ?

  • Propanol

  • 2 - butanol

  • Methanol

  • Ethanol


D.

Ethanol

Ethanol is the common beverage .


17.

The structural formula of picric acid is :


C.

Picric acid is 2 , 4 , 6 - trinitrophenol .It is a strong acid due to the presence of three nitro groups which stabilise trinitrophenoxide ion by resonace .


18.

Among the following the most reactive towards alcoholic KOH is

  • CH2=CHBr

  • CH3COCH2CH2Br

  • CH3CH2Br

  • CH3CH2CH2Br


D.

CH3CH2CH2Br

In alkyl halides, polarity of C - Br bond increases with increase in chain length.


19.

The compound which reacts faster with Lucas reagent is

  • butan-1-ol

  • butan-2-ol

  • 2-methyl-propan-1-ol

  • 2-methyl propan-2-ol


D.

2-methyl propan-2-ol

Tertiary alcohols react faster with Lucas reagent. They give turbidity with Lucas reagent (conc. HCl + anhyd. ZnCl2) at once. Hence, 2-methyl-propan-2-ol will react with Lucas reagent faster.


20.

Propan-1-ol can be prepared from propene by

  • H2O/H2SO4

  • Hg(OAc)2/H2O followed by NaBH4

  • B2H6 followed by H2O2

  • CH3CO2H/H2SO4


C.

B2H6 followed by H2O2

Hydroboration yields 1° alcohol from alkenes.

3CH3CH=CH2 THFBH3 in  (CH3CH2CH2)33H2O2 3CH3CH2CH2OH1-propanol + H3BO3