Class XII Chemistry Organic Compounds Containing Oxygen 1

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Question 1

In the following sequence of reactions,
CH₃CH₂OH the compound ‘D’ is:

• An-propyl alcohol
• Bpropanal
• Cbutanal
• Dn-butyl alcohol

Question 2

During dehydration of alcohols to alkenes by heating with concentrated H₂SO₄ the initiation step is

• Aprotonation of alcohol molecule
• Bformation of carbocation
• Celimination of water
• Dformation of an ester

Question 3

An unknown alcohol is treated with the “Lucas reagent” to determine whether the alcohol is primary, secondary or tertiary. Which alcohol reacts fastest and by what mechanism:

• Atertiary alcohol by S_N1
• Bsecondary alcohol by S_N2
• Ctertiary alcohol by S_N2
• Dsecondary alcohol by S_N1

Question 4

Sodium phenoxide when heated with CO₂ under pressure at 125 °C yields a product which on acetylation produces C.

The major product C would be :

• A
• B
• C
• D

Question 5

From amongst the following alcohols the one that would react fastest with conc. HCl and anhydrous ZnCl₂, is

• A1–Butanol
• B2–Butanol
• C2–Methylpropan–2–ol
• D2–Methylpropanol

Question 6

• AC₆H₅OC₂H₅
• BC₂H₅OC₂H₅
• CC₆H₅OC₆H₅
• DC₆H₅COOH

Question 7

Select schemes A, B, C out of
I acid catalysed hydration
II HBO
III oxymercuration-demercuration

• AI in all cases
• BI, II, III
• CII, III, I
• DIII, I, II

Question 8

To prepare 3-ethylpentane-3-ol, the reactants needed are -

• ACH₃CH₂MgBr +CH₃COCH₂CH₃
• BCH₃MgBr +CH₃CH₂CH₂COCH₂CH₃
• CCH₃CH₂MgBr +CH₃CH₂COCH₂CH₃
• DCH₃CH₂CH₂MgBr +CH₃COCH₂CH₃

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