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JEE Main levelSingle correct optionDifficulty 2 of 3nm184

How many secondary alcohols are there among the open-chain saturated alcohols of molecular formula $C X_{5} H X_{12} O$ ?

A2
B4
C5
D3

Answer: D

Secondary alcohols have

CH (OH)

attached to two carbons: pentan-2-ol, pentan-3-ol and 3-methylbutan-2-ol. Total 3. (Of the 8 alcohols, 4 are primary, 3 secondary and 1 tertiary.)

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