નીચેના સંયોજનોમાં કેન્દ્રાનુરાગી પ્રત્યે $C-X$ બંધ ની વધતી પ્રતિક્રિયાશીલતાનો યોગ્ય ક્રમ કયો છે ?
AIPMT 2010, Medium
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a The order of reactivity, is dependent on the stability of the intermediate carbocation formed by cleavage of $\mathrm{C}-\mathrm{X}$ bond. The $3^o$ carbocation (formed from lil) will be more stable than its $2^o$ counter part (formed from $IV$) which in turn will b more stable than the arenium ion (formed from $I$ ). Also, the aryl halide has a double bond character in the $\mathrm{C}-\mathrm{X}$ bond which makes the cleavage more difficult. However, inspite of all the stated factors, $II$ will be more reactive than $I$ due to the presence of the electron withdrawing - $\mathrm{NO}_{2}$ group. $C-X$ bond becomes weak and undergoes nucleophilic substitution reaction.
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