Classification and IUPAC nomenclature — NEET & JEE Questions

Question 1 · difficulty L1 · recall

In IUPAC nomenclature of an organic compound, the parent chain is generally chosen to contain

• A. the principal functional group and the maximum appropriate carbon skeleton
• B. the fewest carbon atoms possible
• C. only saturated carbon atoms
• D. no substituents

Question 2 · difficulty L2 · understanding

The total number of 'sigma' and 'pi' bonds in 2-oxohex-4-ynoic acid is ______.

Question 3 · difficulty L2 · understanding

$$\text { The IUPAC name of the following compound is : }$$

• A. 2-bromo-5-methylhexylpropanoate
• B. n-propyl-1-bromo-4-methylhexanoate
• C. n-propyl-2-bromo-5-methylheptanoate
• D. 2-bromo-5-methylpropanoate

Question 4 · difficulty L2 · understanding

What is the correct IUPAC name of the compound?

• A. 1-Ethylcyclopent-2-en-3-ol
• B. 4-Ethylcyclopent-2-en-1-ol
• C. 1-Ethyl-3-hydroxycyclopent-2-ene
• D. 4-Ethyl-1-hydroxycyclopent-2-ene

Question 5 · difficulty L2 · understanding

Which of the following is the correct IUPAC name of given organic compound (X)?

• A. 4-Bromo-3-methylbut-2-ene
• B. 1-Bromo-2-methylbut-2-ene
• C. 3-Bromo-3-methylprop-2-ene
• D. 2-Bromo-2-methylbut-2-ene

Question 6 · difficulty L2 · understanding

$$\text { What is the correct IUPAC name of }$$ ?

• A. 3-Bromo-2-hydroxy-5-nitrobenzoic acid
• B. 2-Hydroxy-3-bromo-5-nitrobenzoic acid
• C. 3-Bromo-4-hydroxy-1-nitrobenzoic acid
• D. 5-Nitro-3-bromo-2-hydroxybenzoic acid

Question 7 · difficulty L2 · understanding

In 3,3-dimethylhex-1-en-4-yne, there are _________$\mathrm{sp}^3$,_________$\mathrm{sp}^2$ and_________ sp hybridised carbon atoms respectively.

• A. $4,2,2$
• B. $2,4,2$
• C. $3,3,2$
• D. $2,2,4$

Question 8 · difficulty L2 · understanding

Match List - I with List - II. List - I (Structure) List - II (IUPAC Name) (A) (I) 4-Methylpent-1-ene (B) (CH 3 ) 2 C(C 3 H 7 ) 2 (II) 3-Ethyl-5-methylheptane (C) (III) 4,4-Dimethylheptane (D) (IV) 2-Methyl-1,3-pentadiene Choose the correct answer from the options given below :

• A. (A)-(II), (B)-(III), (C)-(IV), (D)-(I)
• B. (A)-(II), (B)-(III), (C)-(I), (D)-(IV)
• C. (A)-(III), (B)-(IV), (C)-(I), (D)-(II)
• D. (A)-(III), (B)-(II), (C)-(I), (D)-(IV)

Question 9 · difficulty L2 · understanding

In the given structure, number of sp and $\mathrm{sp}^2$ hybridized carbon atoms present respectively are :

• A. 3 and 5
• B. 3 and 6
• C. 4 and 5
• D. 4 and 6

Question 10 · difficulty L2 · understanding

IUPAC name of following hydrocarbon(X) is :

• A. 2,5,6-Trimethyloctane
• B. 2-Ethyl-2,6-diethylheptane
• C. 3,4,7-Trimethyloctane
• D. 2-Ethyl-3,6-dimethylheptane