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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3nm086

Select the correct statements about the number of structural isomers (no stereoisomers).

  1. AThere are 8 amines (primary, secondary and tertiary) of formula .
  2. BThere are 6 alkyl groups of formula .
  3. CThere are 4 aldehydes of formula .
  4. DThere are 4 ketones of formula .

Answer: A, C

Enumeration: C4H11N has 4 primary, 3 secondary and 1 tertiary amine, 8 in all (true). C5H10O aldehydes: pentanal, 2-methylbutanal, 3-methylbutanal, 2,2-dimethylpropanal, 4 (true). Ketones: pentan-2-one, pentan-3-one, 3-methylbutan-2-one, only 3 (false). C5H11 groups: 3 from pentane, 4 from isopentane and 1 from neopentane, 8 (false).
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