General Organic Chemistry (GOC) - 1 - JEE MCQ

- The correct order of priority for functional groups in the IUPAC system is determined by their reactivity and presence in naming conventions.
- Carboxylic acids -COOH have the highest priority due to their strong acidic nature.
- Sulfonic acids -SO₃H  come next because of similar acidity.
- Amides -CONH₂ follow due to their derivation from carboxylic acids.
- Aldehydes -CHO have lower priority than the above groups.
- Therefore, the correct order is: -COOH, -SO₃H, -CONH₂, -CHO, which corresponds to option D.

1º, 2º & 3º H’s are that which is attach at 1º , 2º & 3º carbon respectively.

2-Chloro-4, 4-dimethyl hexane

a, c, f & i are incorrect
 

2-Bromobenzene-1,4-dicarboxylic acid

2, 2, 5-Trimethyl-4-(1-methylpropyl) nonane

Structure 1 (Benzene):

• Benzene has alternating double bonds in a cyclic structure, which can delocalize electrons.
• Shows resonance.

Structure 2 (Cyclohexadienyl cation):

• A positively charged cyclic structure with alternating double bonds can delocalize electrons.
• Shows resonance.

Structure 3 (Cyclohexadienyl anion):

• A negatively charged cyclic structure with alternating double bonds can delocalize electrons.
• Shows resonance.

Structure 4 (Cyclohexadienyl radical):

• A radical in a cyclic structure with alternating double bonds can delocalize electrons.
• Shows resonance.

Structure 5 (Cyclohexane with oxygen and positive charge):

• A positively charged oxygen attached to a saturated cyclic structure cannot delocalize electrons.
• Does not show resonance.

Structure 6 (CH₂=CH–Cl):

• The double bond adjacent to a halogen (chlorine) allows delocalization of lone pair electrons.
• Shows resonance.

Structure 7 (Thiophene):

• Sulfur in a cyclic structure with alternating double bonds can delocalize electrons.
• Shows resonance.

Structure 8 (Phenoxide ion, C₆H₅O⁻):

• The negative charge on oxygen is delocalized into the benzene ring.
• Shows resonance.

Structure 9 (CH₂=CH–CH₂–Cl):

• A chlorine atom attached to a non-conjugated structure cannot delocalize electrons.
• Does not show resonance.

Structure 10 (Pyridine):

• A nitrogen atom in a cyclic structure with alternating double bonds allows delocalization of electrons.
• Shows resonance.

Lack of vacant orbital

(B, C & G).