Practice free Basic Principles of Orgainc Chemistry (Chemistry) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
A negative resonance effect (-R effect) is observed when:
The context states: 'This effect is observed when the transfer of electrons is towards the atom or substituent group attached to the conjugated system. For example in nitrobenzene this electron...'
The most stable carbocation among the following is:
(A) is a 3° carbocation with maximum hyperconjugation and inductive stabilisation.
Given below are two statements:
Statement I: The boiling point of three isomeric pentanes follows the order n-pentane > isopentane > neopentane
Statement II: When branching increases, the molecule attains a shape of sphere. This results in smaller surface area for contact, due to which the intermolecular forces between the spherical molecules are weak, thereby lowering the boiling point.
In the light of the above statements, choose the most appropriate answer from the options given below:
Both standard NCERT facts — II is the correct explanation of I.
Which one of the following compounds can exist as cis-trans isomers?
1,2-Dimethylcyclohexane has two different groups on each of two ring carbons → cis and trans isomers exist. The others lack the required geometric restriction.
Total number of possible isomers (both structural as well as stereoisomers) of cyclic ethers of molecular formula $\text{C}_4\text{H}_8\text{O}$ is:
THF (1), 2-methyloxetane (2 enantiomers), 3-methyloxetane (1), 2-ethyloxirane (2), 2,2-dimethyloxirane (1), 2,3-dimethyloxirane (cis-meso 1 + trans pair 2 = 3): total $= 10$.
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