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Which of the following represent the correct order of acidic strength?
(i) \( \mathrm{HC} \equiv \mathrm{CH}\mathrm{H}_{2} \mathrm{C}=\mathrm{CH}_{2}\mathrm{CH}_{3}-\mathrm{CH}_{3} \)
(ii) \( \mathrm{HC} \equiv \mathrm{CH}\mathrm{CH}_{3}-\mathrm{CH}_{3}\mathrm{H}_{2} \mathrm{C}=\mathrm{CH}_{2} \)
(iii) \( \mathrm{CH}_{3} \mathrm{C} \equiv \mathrm{CH}\mathrm{HC} \equiv \mathrm{CH}\mathrm{CH}_{3}-\mathrm{C} \equiv \mathrm{C}-\mathrm{CH}_{3} \)
(iv) \( \mathrm{HC} \equiv \mathrm{CH}\mathrm{CH}_{3}-\mathrm{C} \equiv \mathrm{CH}\mathrm{CH}_{3}-\mathrm{C} \equiv \mathrm{C}-\mathrm{CH}_{3} \)
(a) (i) and (iii)
(b) (ii) and (iv)
(c) (i) and (iv)
(d) (i) and (iv)
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