Lakshya Education MCQs

Question: The IUPAC name of the following compound is?

A.5, 5-(1,1-Dimethylpropyl)-2-methyldecane
B.5, 5-Bis(1,1-dimethylpropyl)-2-methyldecane
C.5, 5-Bis(1,1-dipropylmethyl)-2-methyldecane
D.None of these
Answer: Option B
: B

Decide the parent chain and give the numbering so that more substituted substituent will get the least number. parent chain 10 carbons word root dec single bond suffix ane substituents at C5andC2 Now,
There is one more same substituent on C5 Therefore, 5,5-Bis-(1,1-dimethyl propyl) Bis Because two same substituents are there, and a methyl group at C2 2-methyl Therefore, 5,5-Bis-(1,1-dimethylpropyl)-2-methyldecane

Submit Answer & Explaination

Earn Reward Points by submitting Detailed Explaination for this Question

More Questions on This Topic :

Question 1. IUPAC name of the following compound is CH3CH=CHCH?
  1.    5-Pentyn-3-ene
  2.    3-Penten-1-yne
  3.    1-Pentyn-3-ene
  4.    None of these
Answer: Option B
: B


From lowest sum rule, we will select 1,3 and not 2,4 Five carbons word root = pent 3-Penten-1-yne
Question 2. What is the correct IUPAC name of the compound?

  1.    1,4-Pentenyne
  2.    Pent-1-en-4-yne
  3.    Pent-1-yn-4-ene
  4.    1, 4-Pentynene
Answer: Option B
: B

While naming, the double bond gets a lower number than the triple bond. C1H2=C2HC3H2C4C5H Wort root = pent Pent-1-en-4-yne Not 4-Penten-1-yne Because, if there is a choice in numbering, the double bond is always given preferenceover the triplebond.
Question 3. The IUPAC name of the following compound is

  1.    1-Methyl-2-ethylcyclohexane
  2.    1-Ethyl-6-Methylcyclohexane
  3.    1-Ethyl-2-Methylcyclohexane
  4.    1-Methyl-6-ethylcyclohexane
Answer: Option C
: C

The numbering is according to the lowest of locants, which gives us two options. In this case, numbering happens according to alphabetical order. So ethyl group will have thelower number. word root = hex primary prefix = cyclo secondary prefix = 1-Ethyl-2-methyl primary suffix = ane IUPAC name is (c)1-Ethyl-2-methylcyclohexane

Check all Questions in this Topic : Click HERE