Which statement about the aldol condensation is correct?

  • A
    $A$. $A$ Lewis acid is commonly used as a catalyst
  • B
    $B$. The initial step is the formation of an enolate ion (carbanion)
  • C
    $C$. $A$ Lewis base is employed to induce carbocation formation
  • D
    $D$. The carbon chain is lengthened through the elimination of $1 \ mole$ of water

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Correct order for nucleophilic addition reaction :
$(1)$ $C_{6}H_{5}COC_{6}H_{5}$
$(2)$ $C_{6}H_{5}CHO$
$(3)$ $p-CH_{3}C_{6}H_{4}CHO$
$(4)$ $p-CH_{3}OC_{6}H_{4}CHO$

Which of the following is not an $o, p-$ directing group?

Find the major product of the following reaction:
$Ph-CHO + CH_3-CHO \xrightarrow[\Delta]{Ca(OH)_2}$ Major product

Identify $A$ in the given chemical reaction:

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