Identify the species from the following that exhibits no-bond resonance (hyperconjugation).

  • A
    $CH_3 CH_2 Br$
  • B
    $CH_3 CH_2^{(+)}$
  • C
    $CH_3 CH_2 NO_2$
  • D
    $CH_3 CH_2 CH_2 CH_3$

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The $+I$ effect of alkyl groups follows the order:

Which acid of each pair shown here would you expect to be stronger?
$(i)$ $CH_3CO_2H$ or $CH_2FCO_2H$
$(ii)$ $CH_2FCO_2H$ or $CH_2ClCO_2H$
$(iii)$ $CH_2FCH_2CH_2CO_2H$ or $CH_3CHFCH_2CO_2H$
$(iv)$ $F_3C-C_6H_4-COOH$ or $H_3C-C_6H_4-COOH$

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Rank the following compounds in order of increasing acidity (weakest acid first).

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Identify ortho and para directing groups from the following: $I. -CHO$,$II. -NHCOCH_3$,$III. -OCH_3$,$IV. -SO_3H$.

Identify the atoms or groups from the following that exhibit $-R$ effect and $+R$ effect when present on a benzene ring:
$-OR, -NHCOR, -CN, -X, -NO_2, -NH_2, -CHO$

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