Question of 90
Q.The number of 3°, 2° and 1° Hydrogen atom present in isopentan are respectively:
(a) 1, 9, 2
(b) 9, 1, 2
(c) 2, 1, 9
(d) 1, 2, 9
Rajasthan RbseRajasthan Board Senior Secondary Part-I Examination 2022MCQ· 1mImportance★★★★★
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Start your 14-day free trial to unlock the full solution →Isopentane has 1 tertiary (3 degree) H, 2 secondary (2 degree) H, and 9 primary (1 degree) H atoms.
Isopentane is 2-methylbutane: CH3-CH(CH3)-CH2-CH3. First classify each carbon by how many OTHER carbons it is bonded to:
- C2 (the CH carbon carrying the methyl branch) is bonded to 3 other carbons (C1, the branch CH3, and C3) -> it is a tertiary (3 degree) carbon, and it carries exactly 1 H.
- C3 (the CH2) is bonded to 2 other carbons (C2 and C4) -> it is a secondary (2 degree) carbon, carrying 2 H. …
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