Question

Select true statement(s):

• A. Instead of radical substitution, cyclopropane undergoes electrophilic addition reactions in sun light.
• B. In general, bromination is more selective than chlorination.
• C. The 2,4,6-tri-tert, butylphenoxy radical is resistant to dimerization.
• D. The radical-catalysed chlorination, ArCH3 ArCH2Cl, occurs faster when Ar = phenyl than whenAr = p-nitrophenyl.

Answer 1

Answer: (B), (C), (D)

The correct options are
B In general, bromination is more selective than chlorination.
C The 2,4,6-tri-tert, butylphenoxy radical is resistant to dimerization.
D The radical-catalysed chlorination, ArCH3 ArCH2Cl, occurs faster when Ar = phenyl than whenAr = p-nitrophenyl.

The statement (A) is false. The statements (B), (C) and (D) are true.

(A) Cyclopropane undergoes radical substitution reactions in sunlight.

(B) In general, bromination is more selective than chlorination as chlorine free radical is more reactive than bromine.

(C) The 2,4,6-tri-tert, butylphenoxy radical is resistant to dimerization.

(D) The radical-catalysed chlorination, $ArC{H}_3$, $ArC{H}_{2}Cl$, occurs faster when Ar = phenyl than when Ar = p-nitrophenyl. The presence of electron withdrawing nitro group in the para position decreases the rate of free radical chlorination.