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Product of bromination, reduction, diazotisation and replacement on a nitrobenzene

This type of question, asked 4 times: 22 Jan 2025, 23 Jan 2025, 23 Jan 2026 S1, 4 Apr 2026 S1. All 5 questions below, oldest first.

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  1. Question 1

    22 Jan 2025

    43
    The products formed when nitrobenzene is taken through the following reaction sequence are : →(i)Br2AcoH(ii)Sn, HCl   A+B(iii)NaNO2, HCl, 273K(iv)C2H5OH\underset{\begin{array}{r} \left( iii \right)NaNO_{2},\ HCl,\ 273K \\ \left( iv \right)C_{2}H_{5}OH \end{array}}{\overset{\begin{array}{r} \left( i \right)Br_{2}AcoH \\ \left( ii \right)Sn,\ HCl \\ \ \end{array}}{\rightarrow}\ \ A + B}

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  2. Question 2

    22 Jan 2025

    50
    Consider the following sequence of reactions : →(i)Sn+HCl(ii)NaNO2,HCl0∘C(iii)Cu2Cl2(iv) Na , EtherAproduct\underset{\begin{array}{r} \left( iii \right)Cu_{2}Cl_{2} \\ (iv)\ Na\ ,\ Ether \end{array}}{\overset{\begin{array}{r} \left( i \right)Sn + HCl \\ {\left( ii \right)NaNO}_{2},HCl \\ \mathbf{0{^\circ}C} \end{array}}{\rightarrow}}A_{product} Molar mass of the product formed (A) is ______ g mol−1g\ mol^{- 1}.

  3. Question 3

    23 Jan 2025

    48
    Consider the following sequence of reactions to produce major product (A) →(i)Br2,Fe(ii)Sn, HCl                       (iii)NaNO2 HCl 273k(iv)H3PO2   H2O\underset{\begin{array}{r} \left( iii \right)NaNO_{2}\ HCl\ 273k \\ (iv)H_{3}PO_{2\ \ \ }H_{2}O \end{array}}{\overset{\begin{array}{r} \left( i \right)Br_{2,}Fe \\ \left( ii \right)Sn,\ HCl \end{array}}{\rightarrow}\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ }(A)Major product(A)_{Major\ product} Molar mass of product (A) is ____\_\_\_\_ gmol−1gmol^{- 1}. (Given molar mass in gmol−1gmol^{- 1} of C:12,H:1C:12,H:1, O:16,Br:80, N:14,P:31)O:16,Br:80,\text{ }N:14,P:31)

  4. Question 4

    23 Jan 2026 S1

    32
    Consider the following sequence of reactions. 4-Nitrotoluene Assuming that the reaction proceeds to completion, then 137 mg of 4-nitrotoluene will produce ____\_\_\_\_ mg of B . (Given molar mass in gmol−1H:1,C:12, N:14gmol^{- 1}H:1,C:12,\text{ }N:14, O :16, Br:80Br:80 )

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  5. Question 5

    4 Apr 2026 S1

    42
    Product C of the following reaction sequence will be

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