General Methods of Preparation, Properties, and Reactions NEET Questions

Organic Chemistry - Organic Compounds Containing Halogens

General Methods of Preparation, Properties, and Reactions MCQ Questions


13.
Which of the following has the longest C–X bond length?
A.
CH₃–Br
B.
CH₃–I
C.
CH₃–F
D.
CH₃–Cl
😑 View Answer Rough Work Error
ANSWER :
B. CH₃–I
14.
The C–X bond enthalpy is highest for:
A.
CH₃–Cl
B.
CH₃–Br
C.
CH₃–F
D.
CH₃–I
😑 View Answer Rough Work Error
ANSWER :
C. CH₃–F
15.
Which of the following alkyl halides has the LOWEST dipole moment?
A.
CH₃–Cl
B.
CH₃–Br
C.
CH₃–F
D.
CH₃–I
😑 View Answer Rough Work Error
ANSWER :
D. CH₃–I
16.
The best reagent for converting an alcohol R–OH into an alkyl chloride R–Cl giving the purest product is:
A.
SOCl₂ (thionyl chloride)
B.
PCl₅
C.
PCl₃
D.
Concentrated HCl alone
😑 View Answer Rough Work Error
ANSWER :
A. SOCl₂ (thionyl chloride)
17.
Alcohols are converted to alkyl bromides using:
A.
NaOBr
B.
Br₂ alone
C.
NaBr + H₂SO₄ (or HBr 48%)
D.
Br₂ + Na₂CO₃
😑 View Answer Rough Work Error
ANSWER :
C. NaBr + H₂SO₄ (or HBr 48%)
18.
Why is H₂SO₄ NOT used in the preparation of alkyl iodide from alcohol and KI?
A.
H₂SO₄ oxidises HI (formed) to I₂, reducing yield of alkyl iodide
B.
H₂SO₄ reduces KI
C.
H₂SO₄ deactivates the alcohol
D.
H₂SO₄ does not generate HI
😑 View Answer Rough Work Error
ANSWER :
A. H₂SO₄ oxidises HI (formed) to I₂, reducing yield of alkyl iodide