3. Halogenation of alkane gives : (a) Only required alkyl halide (b) Alkyl halide and unreacted halogen (c) A mixture of mono-, di-, tri- and tetra-halogen derivatives (d) Alkyl halide and unreacted alkane 4. Which of the following compound has been suggested as causing depletion of the ozone layer in the upper stratosphere ? (a) CH4 (b) CCl2F2 (c) CF4 (d) CH2Cl2
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