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কার্বোনিয়াম আয়নসমূহের স্থায়িত্ব ক্রম হ'ল-

{}^{+}C R_{3} > {}^{+}C H_{2} R > {}^{+}C H R_{2} > {}^{+}C H_{3}

{}^{+}C R_{3} > {}^{+}C H R_{2} > {}^{+}C H_{2} R > {}^{+}C H_{3}

{}^{+}C R_{3} > {}^{+}C H_{2} R > {}^{+}C H R_{2} > {}^{+}C R_{3}

{}^{+}C R_{3} > {}^{+}C H R_{2} < {}^{+}C H_{2} R > {}^{+}C R_{3}

ANS : 2

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