Practice free Basic Principles of Orgainc Chemistry (Chemistry) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
The IUPAC name ofCH3 — CH2— — CH2 - Cl is:
The longest carbon chain is 5, so the root name is 'pentan'. The '3-bromo' prefix indicates the bromine atom at carbon 3. The '1,2-dichloro' prefix indicates the chlorine atoms at carbons 1 and 2. The '3-ol' suffix indicates the alcohol (-OH) group at carbon 3.
The compound which forms one monochloro product when treated with chlorine is:
(c) CH2Cl-C|CH3|CH3-CH3
The electromeric effect in organic compounds is a
Which of the following contains only three pairs of electrons?
Electrophiles are:
(a) Electrophiles are electron deficient species which can share lone pair of electron with carbonion and are thus, called Lewis acids.
Nucleophiles are:
(c) Nuclcophiles are electron rich species and can donate lone pair of electron to carbocation or any +ve centre.
The sigma bond energy of C-H bond in C2H6 is:
(a)
Sigma bond is the first bond formed between any two atoms. ... The C−H bond energy in C2H6 is 99 kcal or 413 KJ/mol
Which of the following is strongest nucleophile?
(d) The order of nucleophilicity depends upon the nature of alkyl group ‘ R' on which a nucleophile to attack as well as on nature of solvent. However, if these are same, then weaker is acid, stronger is base, i.e., stronger is nucleophilicity. This acidic character is:
HI > HBr > HCI > HCN > H2O > EtOH
In hyperconjugation, the atom involved is:
In hyperconjugation, the stabilization of a molecule or ion is achieved by the delocalization of electrons from an adjacent C-H σ bond into an empty or partially filled p-orbital. Therefore, the α-H atom is involved in hyperconjugation.
The stability of 2,3-dimethyl but-2-ene is more than 2-butene. This can be explained in terms of:
The former possesses 12α-H atom whereas, later possesses six α-H atom. More is the no. α-H atom, more is delocalisation and more is stability.
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