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কোন বিক্রিয়াটি সঠিক?

H_{3} C - C N \to_{140 ° C}^{N a C N} H_{3} C - C H_{2} - N H_{2}

H_{3} C - \overset{\overset{O}{∥}}{C} - N H_{2} \overset{B r_{2} / N a O H}{\to} H_{3} C - N H_{2}

H_{3} C - C N \to_{90 ° C}^{H_{2} N i} H_{3} C - C H_{2} - N H_{2}

H_{3} C - C N \to_{140 ° C}^{H_{2} / N i} H_{3} C - C H_{2} - N H_{2}

ANS : 3

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