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Arrange the following compounds in increasing order of reactivity towards the addition of \( \mathrm{HBr} \)
\[
R \mathrm{CH}=\mathrm{CH} R, \mathrm{CH}_{2}=\mathrm{CH}_{2}, R_{2} \mathrm{C}=\mathrm{CH} R, R_{2} \mathrm{C}=\mathrm{C}_{2} \text { : }
\]
(a) \( \mathrm{CH}_{2}=\mathrm{CH}_{2}\mathrm{RCH}=\mathrm{CH} RR_{2} \mathrm{C}=\mathrm{CH} RR_{2} \mathrm{C}=\mathrm{CR}_{2} \)
(b) \( R_{2} \mathrm{C}=\mathrm{CH} R\mathrm{RCH}=\mathrm{CHR}\mathrm{CH}_{2}=\mathrm{CH}_{2}R_{2} \mathrm{C}=\mathrm{CR}_{2} \)
(c) \( \mathrm{RCH}=\mathrm{CH} RR_{2} \mathrm{C}=\mathrm{CR}_{2}R_{2} \mathrm{C}=\mathrm{CH} R\mathrm{CH}_{2}=\mathrm{CH}_{2} \)
(d) \( R_{2} \mathrm{C}=\mathrm{CR}_{2}R_{2} \mathrm{C}=\mathrm{CH} R\mathrm{RCH}=\mathrm{CH} R\mathrm{CH}_{2}=\mathrm{CH}_{2} \)
(e) \( R_{2} \mathrm{C}=\mathrm{CR}_{2}\mathrm{CH}_{2}=\mathrm{CH}_{2}\mathrm{RCH}=\mathrm{CH} RR_{2} \mathrm{C}=\mathrm{CH} R \)
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