Which of the following cannot exist at room temperature?
- ACyclobutadiene
- B$CH_2=CH-CH=CH_2$
- CCyclobutene
- DCyclopentadienyl cation
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For the following carbocations, the correct order of stability is:
$I: ^+CH_2-COCH_3$
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The correct order of the relative stability of the following carbanions is:
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$IV$. $(C_6H_5)_2CH^{-}$
$I$. $HC \equiv C^{-}$
$II$. $CH_2=CH-CH_2^{-}$
$III$. $H_2C=CH^{-}$
$IV$. $(C_6H_5)_2CH^{-}$
Which of the following contains three pairs of electrons around the central carbon atom?
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