In which of the following reactions,two produ | vedclass

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(C) In the Wittig reaction,an aldehyde or ketone reacts with a phosphonium ylide to form an alkene and triphenylphosphine oxide $(Ph_3PO)$. If the res

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$PhCHO + Ph_3P=CHPh 	o$

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(C) In the Wittig reaction,an aldehyde or ketone reacts with a phosphonium ylide to form an alkene and triphenylphosphine oxide $(Ph_3PO)$. If the resulting alkene can exhibit geometric isomerism ($cis/trans$ or $E/Z$),then two products (isomers) are formed.In reaction $(C)$: $PhCHO + Ph_3P=CHPh 	o PhCH=CHPh + Ph_3PO$.The alkene $PhCH=CHPh$ (Stilbene) exists as two geometric isomers: $cis$-stilbene and $trans$-stilbene.In $(A)$,$(B)$,and $(D)$,the alkenes formed do not have geometric isomers because at least one of the double-bonded carbons is attached to two identical groups (e.g.,in $A$,the product is methylenecyclohexane; in $B$,$CH_3CH=C(CH_3)_2$; in $D$,$CH_2=CHCH_3$).

Reactant	$K_{eq.}$
$PhCHO$	$a$
$CH_3CH_2COCH_3$	$b$
$PhCOCH_3$	$c$
$CH_3CHO$	$d$

In which of the following reactions,two products will be formed other than triphenylphosphine oxide $(Ph_3PO)$?

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